A Wet Climate and a Small Root Run

Roses are hardier than their fussy reputation suggests, but there is one thing they genuinely cannot abide, and that is sitting in cold, waterlogged compost. In open ground a rose can send roots down and sideways until it finds drainage. In a pot it has no such escape route. A container is, in effect, a bucket with a handful of holes in the bottom, and after a fortnight of British drizzle that bucket can stay saturated for weeks.

The symptoms show up slowly at first: leaves that yellow between the veins, buds that form and then drop, a general sulking look even though the plant is clearly not dry. By the time the foliage is blackening at the base, the roots have often been rotting for a while. The good news is that almost everything you need to do is simple, cheap and best done before the rain settles in.

Stand Your Containers on Feet

If you take one thing from this article, make it this: never let a pot sit flat on paving, gravel or decking. Water needs somewhere to go once it leaves the drainage holes, and a pot pressed directly onto a hard surface simply seals itself shut.

• Pot feet are the neatest solution, raising the base by two to three centimetres so air can move underneath and water can run away freely.
• Bricks, slate offcuts or timber battens work just as well if you have them lying about. Two or three supports per pot is plenty.
• Clear saucers after heavy rain. A saucer is fine in July, but from October onwards it becomes a reservoir. Tip it out rather than letting the pot stand in it.
• Lift pots onto a gravel bed if you have several grouped together, especially in a corner where rainwater collects.

If a pot feels unusually heavy after rain, that is not a good sign — it means the compost is holding water rather than releasing it. Lift it onto feet and check that the drainage holes have not been blocked by compacted compost or a stray root.

Compost That Lets Water Through

Multi-purpose compost alone is too fine and silty for long-term container roses. It compacts, loses structure and turns sour in wet weather. A loam-based compost blended with plenty of grit is far more forgiving. Aim for roughly three parts loam-based compost to one part horticultural grit or coarse bark, which gives you both moisture retention in summer and free drainage in winter.

Choose the largest pot you can reasonably accommodate. A shrub rose wants a container at least 40 centimetres across; a compact patio variety will manage in 35 centimetres. Bigger pots hold more compost, dry out more slowly in a heatwave and buffer the roots against temperature swings. Unglazed terracotta breathes, which helps, though it dries faster in summer — if you use it, be prepared to water more often in July.

Prune for Air, Not Just Shape

Airflow is your best defence against the fungal troubles that wet weather brings. A rose with a congested centre stays damp for hours after rain, and that is exactly where blackspot and botrytis take hold.

In late winter, cut out any stems that cross through the middle of the plant, along with the thin, spindly growth that will never carry a decent bloom. Cut back to an outward-facing bud so the new shoot grows away from the centre rather than into it. Keep the framework open enough that you could, in theory, post a letter through it.

Through summer, deadhead promptly and remove spent, soggy flowers rather than letting them slump onto the leaves. Take a few leaves off the bottom 15 centimetres of the stems to lift the foliage clear of the compost, and pick up any fallen leaves and petals from the surface. Blackspot spores splash up from the soil, so a clean pot surface genuinely reduces reinfection.

Feed in Growth, Hold Back in Wet Spells

Container roses are entirely dependent on you for nutrition, so feeding matters — but timing matters just as much as quantity.

• Start in spring as new growth breaks, using a balanced rose feed every two to four weeks through the growing season.
• Switch to a potassium-rich feed from midsummer to encourage flowering rather than leafy growth.
• Pause during very wet spells. Saturated roots cannot take up nutrients, and anything you pour on simply leaches straight through the pot. Wait for a drier day.
• Use liquid feeds at half strength for containers. Granular feeds washed through by rain are largely wasted.

Never feed onto bone-dry compost either, as it can scorch the roots. Water first, then feed, and keep a top dressing of grit or gravel around the crown to stop rain splashing soil onto the lower leaves.

Small Habits Through a Wet Season

Space your pots out where you can, leaving a gap of 30 centimetres or so between them so air moves freely. If a container sits against a wall, pull it forward slightly — the wall itself shelters it from rain, which sounds helpful until you realise the compost underneath stays dry while the top looks soaked.

In winter, move pots to a spot sheltered from prevailing wind, still on their feet, but do not bring them indoors. Roses need cold to rest properly. Check them after storms for rocking pots, which tear roots, and firm the compost gently if needed.

Do all of this and your roses will come through the wettest British winter with their roots intact and their vigour ready for spring.