{"id":611977167174,"date":"2025-10-16T16:41:42","date_gmt":"2025-10-16T16:41:42","guid":{"rendered":"https:\/\/blogs.ashridgetrees.co.uk\/blogs\/uncategorized\/when-best-time-planting-herbaceous-perennials\/"},"modified":"2026-04-21T08:40:59","modified_gmt":"2026-04-21T08:40:59","slug":"when-best-time-planting-herbaceous-perennials","status":"publish","type":"post","link":"https:\/\/blogs.ashridgetrees.co.uk\/blogs\/garden-plants\/when-best-time-planting-herbaceous-perennials\/","title":{"rendered":"Herbaceous Perennial Planting Seasons"},"content":{"rendered":"<div class=\"rank-math-block\"><div class=\"rank-math-list \"><div class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">When is the Best Time to Plant Perennials UK?<\/h3>\n<div class=\"rank-math-answer \"><p>Mid-Spring and early Autumn are best. Summer is fine, especially in the shade. Winter often leads to plant failures or setbacks.<\/p><\/div>\n<\/div><\/div><\/div><p>Autumn and Spring are both ideal for planting <a href=\"https:\/\/www.ashridgetrees.co.uk\/collections\/perennial-plants\">perennial plants<\/a>, allowing for strong root development and healthy growth.<\/p><p>Dates will be earlier in the South West, later in cold Northern &amp; Scottish regions.<\/p><h3>Early Autumn (September-October)<\/h3><ul>\n<li>Warm soil promotes root establishment before Winter<\/li>\n<li>Those new roots can take advantage of warm spells<\/li>\n<li>Strong spring growth results<\/li>\n<\/ul><h3>Spring to early Summer, (late April-June)<\/h3><ul><li>After frost, as the soil warms to about 10C, <\/li><\/ul><h3>Midsummer (July-August)<\/h3><ul>\n<li>In Shade: Fine<\/li>\n<li>In Full Sun: With careful watering, possibly shade cloth, usually fine, just don\u2019t plant in a heatwave<\/li>\n<li>Avoid over or under-watering<\/li>\n<\/ul><h3>Winter (November-March)<\/h3><ul>\n<li>Generally avoid planting herbaceous perennials<\/li>\n<li>Risk of rot or stunted spring growth<\/li>\n<li>Better to overwinter in their pots in shelter, plant in Spring<\/li>\n<li>On the other hand, Winter is bareroot planting season for woody perennials like <a href=\"https:\/\/www.ashridgetrees.co.uk\/collections\/garden-trees-big-standards\">trees<\/a>, <a href=\"https:\/\/www.ashridgetrees.co.uk\/collections\/rose-bushes\">roses<\/a>, and <a href=\"https:\/\/www.ashridgetrees.co.uk\/collections\/hedging-plants\">hedging<\/a>\n<\/li>\n<\/ul><div class=\"rank-math-block\"><div class=\"rank-math-list \"><div class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">What is a half-hardy perennial plant?<\/h3>\n<div class=\"rank-math-answer \"><p>These plants tolerate light frost, and generally survive outdoors with winter frost protection like mulch. A prolonged deep freeze is likely to kill them.<\/p><\/div>\n<\/div><\/div><\/div><p>Most perennials we grow are fully <strong>hardy<\/strong> and live outdoors year round across the UK.<br>A <strong>tender<\/strong> perennial will not survive even a breath of frost, so either it can be brought inside for winter (like <a href=\"https:\/\/www.ashridgetrees.co.uk\/collections\/dahlia-tubers\">Dahlia tubers<\/a> often are), or moved to shelter if grown in a pot. <\/p><p>A <strong>half-hardy perennial<\/strong> (HHP) is sort of a fake, in-betweener category caused by growing plants from warm countries in the cooler UK climate: Pelargoniums and Fuchsias are common examples. <br>It\u2019s not a fixed category, because it depends on your local conditions and the microclimate where it grows: in the warm South-West of England and Wales, some tender perennials \u201cbecome\u201d half-hardy. <br>They can withstand a light frost, and will generally survive outdoors in winter with good frost protection such as a pile of straw, mulch, or horticultural fleece, but a prolonged deep freeze may still be too much.<br>Dry soils are typically best for overwintering half-hardy perennials.<\/p><h3>Tips for First-Time Perennial Planters<\/h3><ul>\n<li>Know your soil type, pH, how much light the exact planting site gets in Spring-Summer, and how wet it gets in Winter. <\/li>\n<li>Choose \u201cright plants, right place\u201d, rather than thinking about big changes to the site. <\/li>\n<li>If plants you like aren\u2019t suitable, search for alternatives, which may be a combo to get the desired leaves and foliage.<\/li>\n<li>Space plants according to their mature size, some like a bit of legroom.<\/li>\n<li>Water thoroughly after planting.<\/li>\n<li>Mulch retains moisture and suppress weeds.<\/li>\n<li>Label plants or make a real scale map. <\/li>\n<li>Be patient, perennials often take a year to establish and flower properly.<\/li>\n<\/ul>\n\n<section class=\"prodshow-shopify-block\" \n         id=\"prodshow-block-1\"\n         >\n\t\n\t<div class=\"prodshow-container\">\n\t\t\n\t\t\t\t\t<!-- Multiple Products\/Collection View -->\n\t\t\t<div class=\"prodshow-header\">\n\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t\t<h2 class=\"prodshow-title\">\n\t\t\t\t\t\t\tRelated Products\t\t\t\t\t\t<\/h2>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t<div class=\"prodshow-carousel\" data-carousel=\"prodshow-block-1\">\n\t\t\t\t<div class=\"prodshow-carousel-viewport\">\n\t\t\t\t\t<div class=\"prodshow-carousel-container\">\n\t\t\t\t\t\t<div class=\"prodshow-product-card\">\n\t<a href=\"https:\/\/ashridge-trees.myshopify.com\/products\/rosemary-plants-rosmarinus-officinalis\" \n\t   class=\"prodshow-product-link\" \n\t   target=\"_blank\" \n\t   rel=\"noopener noreferrer\"\n\t   aria-label=\"Common Rosemary Plants\">\n\t\t\n\t\t<div class=\"prodshow-product-image-wrapper\">\n\t\t\t\t\t\t\t<img decoding=\"async\" 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Mid-Spring and early Autumn are best. Summer is fine, especially in the shade.&hellip;<\/p>\n","protected":false},"author":2,"featured_media":613787866297,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[54,78,104],"class_list":["post-611977167174","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-garden-plants","tag-flowers-perennials","tag-planting","tag-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>When to Plant Herbaceous Perennials in the UK<\/title>\n<meta name=\"description\" content=\"Mid-spring &amp; early autumn give the best results for planting perennials. 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