A willow in a pot sounds like a contradiction. These are the trees that line riverbanks and grow fast enough to be cut for baskets every winter. Yet a small group of species and cultivars stay genuinely compact, and with the right container and a bit of routine, they settle into patio life surprisingly well. What you get in return is early catkins, coloured stems in the dull months, and a plant that answers to the secateurs.
Why willow earns its place in a small garden
Most willows grow quickly, which is exactly what you want when a courtyard needs filling. You plant a modest shrub and within two seasons it is a real presence, not a gap waiting to be filled. Willows also flower early, often before the leaves appear, and those catkins are one of the first proper sources of pollen for bees coming out of winter.
They are also unusually forgiving about pruning. Cut a willow back hard and it shoots away again from low down, so you can hold a plant at a manageable size for years rather than watching it creep towards the guttering. The trade-off is thirst. Willows are greedy for water, and a pot dries out far faster than a riverbank, so be honest with yourself about the watering commitment before you buy.
Choosing a dwarf or compact willow
Bushy willows for larger pots
- Salix purpurea ‘Nana’ – the best all-rounder for a patio. A neat rounded shrub with blue-grey leaves, purplish young stems and catkins in early spring. Happy in a pot and easy to keep at around a metre.
- Salix hastata ‘Wehrhahnii’ – slow-growing and mound-forming, with silvery catkins that appear on bare stems. Suits a smaller pot and looks good against a plain wall.
- Salix caprea ‘Kilmarnock’ – the weeping standard you see outside front doors. Not dwarf, but it lives happily in a half-barrel and stays small because it is grafted onto a short stem. Rub out any shoots that appear below the graft.
- Salix integra ‘Hakuro-nishiki’ – not a dwarf either, but cut back each spring it produces fresh pink, white and green foliage on a compact frame. Best treated as a foliage plant rather than a specimen.
Alpine and creeping willows
- Salix repens – creeping willow, low and spreading, and useful for trailing over the rim of a pot. Native to dunes and heaths, so it copes with wind.
- Salix lanata – woolly willow, with felted silver leaves on a slow, rounded plant. Wants sharp drainage and hates sitting wet in winter.
- Salix arbuscula and Salix ‘Boydii’ – mountain and rock-garden willows. Tiny, slow and best in a trough or shallow pan with gritty compost.
- Salix herbacea – dwarf willow, only a few centimetres tall. It needs cool, damp, gravelly conditions and is a poor choice for a warm, sheltered courtyard.
The alpine group wants the opposite of the bushy sorts: free-draining, gritty compost and no standing water. Decide which group suits your space before you fall for a plant at the garden centre.
Pots, compost and drainage
For a shrub willow, go bigger than you think you need. A pot of at least 35–45cm across gives roots room to work and, crucially, holds enough moisture to get through a hot day. Soil-based compost such as John Innes No. 2 or 3 holds water far better than a light multipurpose mix, so it is worth the extra cost. Mix in some garden compost or loam if you have it.
Stand the pot on feet so water drains freely, and put a saucer underneath only for the thirsty shrub willows. For alpine species, use a shallow pan of roughly half grit to half compost and no saucer at all. Repot every two to three years in early spring, trimming about a third off the rootball and refreshing the compost. If you are placing a large pot on a balcony, check the weight is within what the structure is designed to carry, and ask a qualified professional if you are unsure.
Watering and feeding
In summer, check pots daily and water until it runs out of the base. In a hot, sheltered courtyard you may need to water morning and evening. A gravel or bark mulch over the surface slows evaporation, and grouping pots together helps as well. Keep the compost consistently moist rather than alternating between drought and flood.
Feeding should be light. A slow-release feed in spring, or a liquid feed every fortnight through the growing season, is plenty. Too much nitrogen gives you soft, floppy growth and fewer catkins. In winter, cut back on water but never let the compost dry out completely, and move alpine species somewhere sheltered from persistent rain.
Pruning: the key to staying small
Most willows flower on the previous year’s growth, so the timing of your cut decides what you get. If catkins matter most, prune straight after flowering in spring. If compact size matters more, cut hard in late winter and accept a quieter display that year. Either way, aim to cut back to a bud and take out any dead or crossing shoots first.
Coloured stems, such as the purple-red of ‘Nana’, show best on young wood, so a yearly trim keeps both size and colour in check. One warning: willow cuttings root in almost anything, including a heap of damp prunings. Bag them for the tip rather than the compost bin.
Making it work in a courtyard
One well-grown specimen in a generous pot looks far better than five cramped ones competing for water. Put the plant where you will actually see the catkins – beside a door, or raised on a plinth at eye level – and leave the hot south-facing wall a little clear in midsummer, since pots there dry out twice as fast. Underplant with sedums, heathers or small alpines that enjoy similar conditions, and let creeping willow spill over the edge of a raised bed for a softer finish.
A simple year-round routine
- Late winter: hard-prune shrub willows if you want to control size, repot if needed, and top-dress the compost.
- Early spring: enjoy the catkins, then trim lightly once they fade. Start feeding.
- Late spring to summer: water daily, mulch the surface, and remove any shoots sprouting below a graft.
- Autumn: tidy spent leaves, check drainage holes are clear, and stop feeding.
- Winter: raise pots off cold paving, remove saucers so roots never sit wet, and shelter alpines from heavy rain.
Get those five habits right and a willow will reward you for years in a space no bigger than a few paving slabs.
Photo: Karen F / Pexels
