When to Plant Hanging Baskets in the UK
The short answer: plant new summer baskets from the first week of May, and refresh them for late-summer colour in mid-August. Those are the two windows that matter in the UK, and this guide walks through both, month by month, so you never plant too early or too late again.
- May is the window for new summer baskets - wait until the frost risk has passed
- Feed weekly from June with a high-potash liquid feed like Tomorite
- Mid-August is the refresh window: cut back, replant edges, top-dress with fresh compost
- Use moisture-control compost for pots and baskets to cut watering in half
- Fuchsias, calibrachoa and nasturtiums are the fastest August replants
The Short Answer
If you're starting from scratch with summer bedding, wait until the frost risk has gone - from early May in the south, mid-May further north. For late-summer colour, the second window opens in mid-August, when you either refresh tired baskets or replant them with autumn-flowering plants. Get those two timings right and you have colour from June to the first frost.
Why Timing Matters: UK Frost Dates
Baskets live in containers, but the plants inside them are still frost-tender. A warm spell in April fools plenty of gardeners into planting early, then a single cold night wrecks the lot. UK average last-frost dates run from late April in London and the south coast to mid-May in the Midlands and early June in northern Scotland. Work from your local date, add a week's buffer, and you can't go far wrong.
May: Planting New Summer Baskets
Early May is the classic UK window for a full summer basket. Start from a hanging basket plug plant collection or build your own with trailing fuchsias, calibrachoa and lobelia. Use moisture-control compost made for pots and baskets - it holds water far longer than standard multi-purpose, which matters when a basket dries out in hours on a sunny wall.
Mix in water-retaining gel if the basket hangs in full sun. Plant three to five plants in a 30cm basket, firm them in, and water thoroughly.
June and July: Feeding and Topping Up
Once baskets are established, the job shifts to feeding and watering. The frequent watering baskets need flushes nutrients out of the compost fast, so feed weekly with a high-potash feed like Levington Tomorite to push flowers rather than leaves. If a plant dies or looks sickly, pull it out and slot in a fresh plug instead of waiting for it to recover. Keep deadheading as you water and the display keeps coming.
Mid-August: The Late-Summer Refresh
This is the window most UK gardeners miss, and it's the one that keeps baskets alive into autumn. By mid-August the petunias have gone leggy and the lobelia is patchy, but there's still six to eight weeks of decent weather ahead. Cut the leggy growth back by a third, replace the tired edge plants with fuchsia plug plants or calibrachoa, and top-dress with fresh compost. Trailing nasturtium seeds flower within two weeks of sowing, which makes them the fastest fix in the calendar.
September and October: Stretching the Season
Late-season baskets need a little protection. Keep feeding weekly while flowers are still coming, and move baskets under cover if frost is forecast. Tender annuals like calibrachoa and lobelia die in a hard frost, but fuchsias and begonias survive light frosts. A lightweight fleece thrown over the basket on cold nights buys you another couple of weeks of colour, and fuchsia tubers can be cut back and overwintered indoors.
What You Need Before You Plant
Get the kit together before the weekend so planting is a one-hour job rather than a trip to the garden centre. You need a moisture-control compost, a watering can with a removable rose for gentle watering, a high-potash feed, and either plugs or seeds depending on how fast you want results. A decent pair of Felco 2 secateurs makes deadheading and the August cut-back quick and clean.
Frequently Asked Questions
Final Verdict
Plant new summer baskets in May, feed them through June and July, and refresh them in mid-August. That pattern gives you six months of colour from a single set of baskets, and the mid-August refresh is the difference between a garden that looks tired in September and one that still glows. Pair a decent moisture-control compost with weekly feeding and you're most of the way there.
Emma turned her 6th-floor balcony into a thriving edible garden during lockdown. Now she helps other urban dwellers maximise every inch of growing space - hanging baskets included.
As an Amazon Associate we earn from qualifying purchases.
Last reviewed: August 13, 2026 Β· Evidence-based content Β· Contains affiliate links