Knowing when to prune is the difference between a good garden and a great one

Pruning has a reputation for being complicated, but almost all of it comes down to one question: when to prune. Cut a plant at the right moment and you get more flowers, healthier growth and a shapely, long-lived shrub. Cut the same plant at the wrong moment and you can remove a whole year of blooms, invite disease, or trigger soft growth that the first frost destroys. The plant hasn't changed. Only the timing has. That is why knowing when to prune matters far more than any fancy technique.

This tool takes the anxiety out of it. Pick a plant, tell it roughly what month it is, and you will see the right pruning window for a UK garden, how hard to cut, what the plant flowers on, and when to expect those flowers. The calendar strip shows pruning time and flowering time together across all twelve months, so you can see at a glance whether you should reach for the secateurs now or leave well alone.

When to prune roses, shrubs and the plants everyone worries about

A few plants cause most of the questions, and most of the mistakes. Knowing when to prune roses is the classic one: bush roses want a hard cut in late winter as growth resumes, while rambling roses are pruned in late summer straight after flowering, because they bloom on the previous year's wood. Get those two mixed up and you either lose the flowers or leave the plant a tangled mess. It is the single most useful thing to learn about when to prune shrubs in general.

The same golden rule solves most of the rest. Plants that flower in spring, like forsythia, philadelphus, lilac and weigela, are pruned immediately after flowering, never in winter, because they flower on last year's growth. Hydrangeas follow the same logic: leave the old heads on for winter protection, then cut back to the fat buds in early spring. Plants that flower from midsummer onwards, like buddleja and late clematis, are cut back hard in early spring, because they flower on new growth. Fruit trees are their own case, with apple and pear pruned in the dormant depths of winter. Learn which camp a plant sits in and knowing when to prune hedges, climbers, shrubs and trees stops being guesswork.

The timing traps worth knowing about

A handful of plants punish bad timing more than others, and they are worth committing to memory. Stone fruit such as plums and cherries should only be pruned in summer, never in the dormant months, because winter cuts open the door to silver leaf disease that can kill the tree. Lavender and rosemary should be trimmed after flowering and never cut into bare old wood, which rarely regrows. Acers and magnolias resent pruning and bleed if cut in spring, so leave them almost alone. Wisteria needs two prunes a year to flower well. And hedges are best clipped in late summer once nesting birds have fledged.

None of this is difficult once you know the timing. Pruning is one of the most rewarding jobs in the garden: a few minutes with clean, sharp secateurs at the right moment shapes a plant for years to come. Use the tool above whenever you are standing in front of something wondering whether now is the moment, get the timing right, and let the plant reward you for it.