Rose Growing Calendar: What to Do in Each Season

The shape of the rose year

A rose year has four distinct phases. Late winter is structural: prune, clear and mulch. Spring is about funding the first flush and catching aphids early. Summer is flush, deadhead, feed, flush again, with disease watch running throughout. Autumn is about slowing the plant down and clearing away the material that carries disease into next year.

Almost every recurring rose problem is a job done at the wrong point in that cycle. Feeding nitrogen in late summer, pruning a rambler in late winter, leaving fallen leaves under the bush over winter, watering overhead in the evening: each one costs you in the phase that follows rather than immediately, which is why the cause is easy to miss.

Late winter and spring: setting the year up

The late winter prune decides the shape of the plant for the whole season, and the clearing that goes with it decides how much disease pressure you face. Rake out every old leaf from under the bush, remove any that are still hanging on the canes, and lay a fresh two to three inch (5 to 8 cm) mulch over the cleared ground.

As the buds break, put on the first feed and start looking at shoot tips. The first aphid colony of the year almost always appears on the very softest new growth within a fortnight of bud break, and it is far easier to deal with then than at any later point.

1. Prune as the buds swell Wait until the buds are visibly plumping but have not opened. Cutting in hard frost damages the exposed tissue at every cut.
2. Clear before you mulch Old leaves buried under fresh mulch still carry black spot spores upward through the mulch. Rake them out and bin them first.
3. Feed at bud break Scatter a balanced granular rose feed over the root zone and water it in. This is the feed that funds the first flush.
4. Start the twice weekly walk round From bud break, check the shoot tips and the flower buds every few days. Two minutes twice a week replaces most of the work later in the year.

Summer: keeping the flushes coming

Between flushes the plant is rebuilding, and what you do in that gap decides how strong the next flush is. Deadhead promptly, feed as the first flush finishes, and water deeply rather than often. A rose that runs dry between flushes produces a noticeably thinner second one.

Disease watch runs all summer, but the target shifts. Early summer is black spot on the lower leaves in humid weather; high summer brings powdery mildew on dry rooted plants and spider mites in hot, still corners. Look at the lower leaves and the new shoot tips each time you pass.

Ramblers are pruned in this window, straight after their single flush finishes. Leave it until late winter and you cut off the wood that would have carried next year's flowers.

Autumn and early winter: slowing it down

From late summer the aim reverses: instead of pushing growth you want the wood to ripen and the plant to slow down. Stop feeding nitrogen about eight weeks before the first expected frost, and stop deadheading on hip bearing roses so they set fruit, which is itself a signal to the plant that the season is ending.

The single most valuable autumn job is clearing fallen leaves. Black spot overwinters on them, and every leaf left under the bush is next spring's starting infection. Rake, bin and mulch, and the disease pressure you face in spring is measurably lower.

Reading a disappointing year backwards

When a season goes badly it is worth tracing the cause back rather than changing everything at once. Most rose disappointments have a single identifiable cause several months upstream of the symptom, and the correction belongs in that earlier season.

Four dates a year are enough to make these comparisons possible: the prune date, the first bloom, the first black spot, and the date you stopped feeding. Written down, they turn guesswork into a pattern within two seasons.