{"id":1012,"date":"2023-01-16T14:32:34","date_gmt":"2023-01-16T13:32:34","guid":{"rendered":"https:\/\/ticinoweb02.jcloud.ik-server.com\/alpagrum\/rustic-citrus\/"},"modified":"2025-10-29T22:32:18","modified_gmt":"2025-10-29T21:32:18","slug":"rustic-citrus","status":"publish","type":"page","link":"https:\/\/alpagrumi.ch\/en\/rustic-citrus\/","title":{"rendered":"Coldhardy citrus"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1012\" class=\"elementor elementor-1012 elementor-587\" data-elementor-post-type=\"page\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-b4533ab elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b4533ab\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t\t<div class=\"elementor-background-overlay\"><\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-1404580\" data-id=\"1404580\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-98a7bc3 elementor-widget elementor-widget-heading\" data-id=\"98a7bc3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-xxl\">Hardy citrus<\/h1>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-ce559a9 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"ce559a9\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-afb4e8f\" data-id=\"afb4e8f\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;animation&quot;:&quot;none&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-d47a7f6 elementor-widget elementor-widget-heading\" data-id=\"d47a7f6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Cold resistant citrus<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f049c32 elementor-widget elementor-widget-text-editor\" data-id=\"f049c32\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>The citrus trees for sale on this site are all cold resistant, from -8 C to -16 C for the most rustic.<\/p><p>The rootstocks used offer the best combination of frost resistance and vigor.<\/p><p>The grafts were taken from mother trees that have endured intense outdoor cold waves, most of them from nurseries or farmers, sometimes from private gardens. Their selection is the result of meticulous observations throughout the decades, by gardeners with an attentive eye, but also of multiple exchanges between enthusiasts. All these mother trees were grown in the open ground, with a good exposure, protected from strong winds, well fed and irrigated.<\/p><p>The hardiness levels remain indicative and apply to adult trees in dormancy in the middle of winter, in a sheltered situation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3033fe7 elementor-widget elementor-widget-heading\" data-id=\"3033fe7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Cold hardiness of adult trees<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1e9e01e elementor-widget elementor-widget-image\" data-id=\"1e9e01e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"930\" height=\"2000\" src=\"https:\/\/alpagrumi.ch\/wp-content\/uploads\/sites\/78\/2025\/10\/Table-Varietes-arbres-6-EN.jpg\" class=\"attachment-2048x2048 size-2048x2048 wp-image-17514\" alt=\"Citrus hardiness table\" srcset=\"https:\/\/alpagrumi.ch\/wp-content\/uploads\/sites\/78\/2025\/10\/Table-Varietes-arbres-6-EN.jpg 930w, https:\/\/alpagrumi.ch\/wp-content\/uploads\/sites\/78\/2025\/10\/Table-Varietes-arbres-6-EN-140x300.jpg 140w, https:\/\/alpagrumi.ch\/wp-content\/uploads\/sites\/78\/2025\/10\/Table-Varietes-arbres-6-EN-476x1024.jpg 476w, https:\/\/alpagrumi.ch\/wp-content\/uploads\/sites\/78\/2025\/10\/Table-Varietes-arbres-6-EN-768x1652.jpg 768w, https:\/\/alpagrumi.ch\/wp-content\/uploads\/sites\/78\/2025\/10\/Table-Varietes-arbres-6-EN-714x1536.jpg 714w, https:\/\/alpagrumi.ch\/wp-content\/uploads\/sites\/78\/2025\/10\/Table-Varietes-arbres-6-EN-600x1290.jpg 600w\" sizes=\"(max-width: 930px) 100vw, 930px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e29c802 elementor-widget elementor-widget-text-editor\" data-id=\"e29c802\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>USDA <em>(U.S. Department of Agriculture)<\/em> climate zones indicate thermal minima observed over the last 30 years.<br>Climate zones in Switzerland range from 5a (coldest) to 9a (warmest).<\/p><p>Hardiness levels are indicated for mature trees in open ground and in wind-protected situations, for intense but brief frosts.<br>Trees can withstand night frosts,<span class=\"BxUVEf ILfuVd\" lang=\"fr\">even<\/span>several nights in a row, provided the daytime temperature rises to at least 4 or 5 degrees above zero.<\/p><p>It&#8217;s the wood &#8211; the trunk and main branches &#8211; that guarantees resistance to extreme cold.<br>Trees subjected to strong, prolonged frost can suffer damage to young shoots.<br>In this case, damaged small branches should be pruned just before spring, so that they can be regenerated with the first growth in April-May. <br>An exceptionally cold spell is always possible, with damage to secondary branches. <br>A more drastic pruning will then be required to ensure a good restart.<\/p><p>For young trees, when heavy frosts are forecast, add or reinforce the mulch.<br>It is possible to lay a non-woven fabric veil, but this will have to be removed once the cold snap has passed. Be careful not to let the veil touch the leaves, install it on 4 sticks planted around the young tree.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e692245 elementor-widget elementor-widget-heading\" data-id=\"e692245\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-xl\">USDA climate zones in Switzerland<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-33c1e7a elementor-widget elementor-widget-text-editor\" data-id=\"33c1e7a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>To find out which varieties you can plant in your area, first check your USDA climate zone<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3e75dd7 elementor-widget elementor-widget-text-editor\" data-id=\"3e75dd7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>To find the nearest city, please visit the site:<\/p><p><em><a href=\"https:\/\/www.plantmaps.com\/interactive-switzerland-plant-hardiness-zone-map-celsius.php\">https:\/\/www.plantmaps.com\/interactive-switzerland-plant-hardiness-zone-map-celsius.php<\/a><\/em><\/p><p><em> <\/em>The interactive map allows you to zoom in on your town and identify the USDA climate zone of the planned planting.<\/p><p>For a detailed view of thermal minima measured since 1991, please consult the following link:<\/p><p><a href=\"https:\/\/www.meteosuisse.admin.ch\/services-et-publications\/applications\/valeurs-mesurees-et-reseaux-de-mesure.html#param=messwerte-lufttemperatur-10min&amp;table=false&amp;station=PAY&amp;chart=day&amp;compare=y\"><em>Weather Switzerland &#8211; Temperature<\/em><\/a><\/p><p>Click on the nearest weather station to access the data by selecting &#8220;Comparison with climatic data&#8221;.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-336b2cd elementor-widget elementor-widget-elementskit-accordion\" data-id=\"336b2cd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"elementskit-accordion.default\">\n\t\t\t\t\t<div class=\"ekit-wid-con\" >\n        <div class=\"elementskit-accordion floating-style\" id=\"accordion-69d7c68660636\">\n\n            \n                <div class=\"elementskit-card \">\n                    <div class=\"elementskit-card-header\" id=\"primaryHeading-0-336b2cd\">\n                        <a href=\"#collapse-a55b8af69d7c68660636\" class=\"ekit-accordion--toggler elementskit-btn-link collapsed\" data-ekit-toggle=\"collapse\" data-target=\"#Collapse-a55b8af69d7c68660636\" aria-expanded=\"false\" aria-controls=\"Collapse-a55b8af69d7c68660636\">\n                                                            <div class=\"ekit_accordion_icon_left_group\">\n                                    <div class=\"ekit_accordion_normal_icon\">\n                                        <!-- Normal Icon -->\n                                        <i class=\"icon icon-plus\"><\/i>                                    <\/div>\n\n                                    <div class=\"ekit_accordion_active_icon\">\n                                        <!-- Active Icon -->\n\t\t\t\t\t\t\t\t\t\t<i class=\"icon icon-up-arrow\"><\/i>                                    <\/div>\n                                <\/div>\n\n                            \n                            <span class=\"ekit-accordion-title\">Local conditions and micro-climates<\/span>\n\n                            \n                                                    <\/a>\n                    <\/div>\n\n                    <div id=\"Collapse-a55b8af69d7c68660636\" class=\" collapse\" aria-labelledby=\"primaryHeading-0-336b2cd\" data-parent=\"#accordion-69d7c68660636\">\n\n                        <div class=\"elementskit-card-body ekit-accordion--content\">\n                            <p>USDA climate zones are defined by the minimum temperatures reached during the year (usually in January or February).<\/p>\n<p>However, within a given region, minimum temperatures can change significantly, sometimes within a few kilometers or even only a few hundred meters away.<\/p>\n<p>Factors that positively influence thermal minima include:<\/p>\n<ul>\n<li>The orientation of the land<\/li>\n<\/ul>\n<p>A southern exposure strongly attenuates the minima and their duration<\/p>\n<ul>\n<li>Wind protection<\/li>\n<\/ul>\n<p>A sheltered area will gain in heat, extreme cold will be shorter<\/p>\n<ul>\n<li>The presence of a lake<\/li>\n<\/ul>\n<p>A body of water, if large enough, will dampen and shorten cold spells.<\/p>\n<ul>\n<li>The urban environment<\/li>\n<\/ul>\n<p>In the city and suburbs, the urban bubble effect reduces nighttime lows by several degrees in winter.  <\/p>\n<p>These factors can combine to create 8a\/8b <em>(-12.2 C to -6.7 C)<\/em> islands in the heart of a 7a\/7b region <em>(-17.8 C to -12.2 C)<\/em>.<\/p>\n                        <\/div>\n\n                    <\/div>\n\n                <\/div><!-- .elementskit-card END -->\n\n                \n                <div class=\"elementskit-card \">\n                    <div class=\"elementskit-card-header\" id=\"primaryHeading-1-336b2cd\">\n                        <a href=\"#collapse-ff13fb169d7c68660636\" class=\"ekit-accordion--toggler elementskit-btn-link collapsed\" data-ekit-toggle=\"collapse\" data-target=\"#Collapse-ff13fb169d7c68660636\" aria-expanded=\"false\" aria-controls=\"Collapse-ff13fb169d7c68660636\">\n                                                            <div class=\"ekit_accordion_icon_left_group\">\n                                    <div class=\"ekit_accordion_normal_icon\">\n                                        <!-- Normal Icon -->\n                                        <i class=\"icon icon-plus\"><\/i>                                    <\/div>\n\n                                    <div class=\"ekit_accordion_active_icon\">\n                                        <!-- Active Icon -->\n\t\t\t\t\t\t\t\t\t\t<i class=\"icon icon-up-arrow\"><\/i>                                    <\/div>\n                                <\/div>\n\n                            \n                            <span class=\"ekit-accordion-title\">Good places to plant<\/span>\n\n                            \n                                                    <\/a>\n                    <\/div>\n\n                    <div id=\"Collapse-ff13fb169d7c68660636\" class=\" collapse\" aria-labelledby=\"primaryHeading-1-336b2cd\" data-parent=\"#accordion-69d7c68660636\">\n\n                        <div class=\"elementskit-card-body ekit-accordion--content\">\n                            <p>To guarantee an optimal growth to a citrus tree it is necessary to install it in a place sheltered from the wind, well exposed to the sun especially in the morning.<\/p>\n<p>You can plant near a house without fear, the main root of a citrus tree will plunge vertically into the ground. No risk for the foundations. The horizontal surface roots are not penetrating. The heat radiated by the walls will make you gain several degrees.<\/p>\n<p>A dense hedge or a perimeter wall will also have a moderating effect on the extremes.<\/p>\n<p>If you're planting in an orchard, don't space the trees too far apart.<br \/>Check the recommended planting distance in the description of the citrus fruit of your choice.<\/p>\n                        <\/div>\n\n                    <\/div>\n\n                <\/div><!-- .elementskit-card END -->\n\n                \n                <div class=\"elementskit-card \">\n                    <div class=\"elementskit-card-header\" id=\"primaryHeading-2-336b2cd\">\n                        <a href=\"#collapse-a90af5e69d7c68660636\" class=\"ekit-accordion--toggler elementskit-btn-link collapsed\" data-ekit-toggle=\"collapse\" data-target=\"#Collapse-a90af5e69d7c68660636\" aria-expanded=\"false\" aria-controls=\"Collapse-a90af5e69d7c68660636\">\n                                                            <div class=\"ekit_accordion_icon_left_group\">\n                                    <div class=\"ekit_accordion_normal_icon\">\n                                        <!-- Normal Icon -->\n                                        <i class=\"icon icon-plus\"><\/i>                                    <\/div>\n\n                                    <div class=\"ekit_accordion_active_icon\">\n                                        <!-- Active Icon -->\n\t\t\t\t\t\t\t\t\t\t<i class=\"icon icon-up-arrow\"><\/i>                                    <\/div>\n                                <\/div>\n\n                            \n                            <span class=\"ekit-accordion-title\">If you need to keep your trees in pots  <\/span>\n\n                            \n                                                    <\/a>\n                    <\/div>\n\n                    <div id=\"Collapse-a90af5e69d7c68660636\" class=\" collapse\" aria-labelledby=\"primaryHeading-2-336b2cd\" data-parent=\"#accordion-69d7c68660636\">\n\n                        <div class=\"elementskit-card-body ekit-accordion--content\">\n                            <p>A citrus tree will only express its full potential if it is planted in the ground.<\/p>\n<p>If the minimum temperatures in your region do not allow it for the varieties you have chosen, you will have to keep them in pots.<\/p>\n<p>Trees will lose some of their hardiness by staying in a pot. In a classic pot, with rigid walls, the roots are concentrated against these walls and will be very exposed to frost.<br \/>In an Air-Pot, the roots are distributed throughout the volume and will be more protected. In this case, the loss of resistance to the cold can be estimated at 5 to 6 degrees.<br \/>The best solution is to shelter them over winter in a greenhouse maintained between a minimum of -5 degrees (at night) and a maximum of +10 to +15 degrees (during the day), then take them out in spring.<br \/>Alternatively, surround the pot with a double layer of thick jute.  Add thick mulch to the soil around the pot. If the size of the tree allows it, apply a TNT veil of 19gr\/m2 (minimum) without sticking it on the leaves. Use 4 sticks to build a box around the plant, keep the veil on the ground with large rocks or bricks.<\/p>\n<p>All the trees sold on this site are raised in Air-Pots (<a href=\"https:\/\/air-pot.com\/\"><br \/>\n  see the manufacturer's website<br \/>\n<\/a>), specially shaped pots that guarantee the integrity of the roots in the long term.<\/p>\n<p>As the tree grows, it should be transplanted to a larger Air-Pot. In theory there is no limit to the size of the Air-Pots, the system being designed to be expandable. In practice, it will become difficult to move the trees quickly because of their weight. A reduction pruning each year will therefore be unavoidable, unless you can plant directly in the greenhouse.<\/p>\n<p><em>Note:<br \/><\/em><em>Don't throw the Air-Pots away. You can reuse them or return them to us.  <br \/><\/em><\/p>\n                        <\/div>\n\n                    <\/div>\n\n                <\/div><!-- .elementskit-card END -->\n\n                                        <\/div>\n    <\/div>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6a894e6 elementor-widget elementor-widget-heading\" data-id=\"6a894e6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-xl\">How to choose your citrus tree on AlpAgrumi.ch<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6c848e2 elementor-widget elementor-widget-text-editor\" data-id=\"6c848e2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ol><li>First check your USDA <strong>climate zone<\/strong>.<br>See above:<br><em><u>USDA climate zones in Switzerland<br><\/u><\/em><em><u><a href=\"https:\/\/www.plantmaps.com\/interactive-switzerland-plant-hardiness-zone-map-celsius.php\">Map of USDA climate zones in Switzerland<\/a><br><\/u><\/em><em> <\/em><\/li><li>Do <strong>local<\/strong> conditions tend to be <strong>favorable <\/strong>?<br>If you live in a valley, is the slope sunny or shady?<br>On the plain, are you sheltered by hills or forests?<br>Is there a lake nearby?<br>See above:<br><u><u><u><u><u><u><u><u><u>Local conditions and micro-climates<\/u><\/u><\/u><\/u><\/u><\/u><\/u><\/u><\/u><p> <\/p><\/li><li>Do you have a <strong>protected spot<\/strong> for planting?<br>Can you plant near a house, a wall, behind a hedge?<br>While guaranteeing your tree good exposure to the sun, especially in the morning?<br>See above:<br><u>Favourable planting locations<br><\/u><em> <br><\/em><\/li><li>Consult the list of citrus trees on this page.<br>Choose <strong>trees compatible<\/strong> with your local climatic conditions.<br>Don&#8217;t forget to also consider the type of soil and therefore the most suitable rootstock (see <a href=\"https:\/\/alpagrumi.ch\/en\/rootstocks\/\"><u>Rootstocks<\/u><\/a>)<\/li><li>Visit our <a href=\"https:\/\/alpagrumi.ch\/boutique\/\"><u>eShop<\/u><\/a> to order and choose between Shipping and Pick-up. <br>If you are collecting your trees from our Monte-Carasso (Bellinzona) store, please remember to <a href=\"https:\/\/alpagrumi.ch\/en\/book-an-appointment\/\"><u>book your appointment<\/u><\/a>  <\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Hardy citrus Cold resistant citrus The citrus trees for sale on this site are all cold resistant, from -8 C to -16 C for the most rustic. The rootstocks used offer the best combination of frost resistance and vigor. The grafts were taken from mother trees that have endured intense outdoor cold waves, most of [&hellip;]<\/p>\n","protected":false},"author":1630,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"_seopress_robots_primary_cat":"","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","footnotes":""},"class_list":["post-1012","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/alpagrumi.ch\/en\/wp-json\/wp\/v2\/pages\/1012","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/alpagrumi.ch\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/alpagrumi.ch\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/alpagrumi.ch\/en\/wp-json\/wp\/v2\/users\/1630"}],"replies":[{"embeddable":true,"href":"https:\/\/alpagrumi.ch\/en\/wp-json\/wp\/v2\/comments?post=1012"}],"version-history":[{"count":5,"href":"https:\/\/alpagrumi.ch\/en\/wp-json\/wp\/v2\/pages\/1012\/revisions"}],"predecessor-version":[{"id":19702,"href":"https:\/\/alpagrumi.ch\/en\/wp-json\/wp\/v2\/pages\/1012\/revisions\/19702"}],"wp:attachment":[{"href":"https:\/\/alpagrumi.ch\/en\/wp-json\/wp\/v2\/media?parent=1012"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}