Deadheading

Deadheading simply means removing flowers once they have gone over — faded, browned or started to collapse. You pinch or snip them off before they can turn into seed pods or seed heads. It is one of the easiest jobs in the garden, and on many flowering plants it makes a real difference to how long and how generously they bloom.

Why it prolongs flowering

A plant's goal is not to look pretty — it is to set seed. Once a flower is pollinated, the plant pours its energy into ripening seed, and many will then slow down or stop flowering altogether, their job done. By removing the spent blooms before seed forms, you keep the plant "trying again", sending up fresh flowers in the hope of finally reproducing. For beginners this is the cheapest way to double the flowering season of cosmos, sweet peas, dahlias, roses, petunias and most bedding plants. A quick once- or twice-weekly go-over through summer is usually all it takes.

It pairs naturally with pinching out, which encourages bushier, more flower-laden plants in the first place — together they keep a display full and tidy.

When to leave the seed heads instead

Deadheading is not always the right call, and a wildlife-friendly garden often skips it on purpose. Reasons to leave faded flowers and let seed heads form:

• Food for birds. Seed heads on teasel, sunflowers, verbena and many grasses feed goldfinches and other birds through autumn and winter.
• Self-seeding. If you want plants like foxgloves, poppies, honesty, nigella (love-in-a-mist) or calendula to scatter themselves and come back next year for free, you need to let some flowers set seed.
• Winter structure. Left-standing seed heads catch frost and look striking on a cold morning, and the hollow stems give insects somewhere to shelter.
• Saving your own seed. If you plan to collect seed to sow next spring, leave a few of the best flowers to ripen fully.

A common middle path is to deadhead through the main summer flush to keep the colour coming, then ease off in late summer and let the final flowers run to seed — feeding birds, restocking the garden and giving you something to look at in winter.

A note on fruit and veg

The same instinct applies in the kitchen garden, just in reverse. With herbs and leafy crops you often pinch out flower buds to stop the plant bolting — running to flower and seed, which turns leaves bitter. But with anything you are growing for its fruit or pods — beans, courgettes, tomatoes — you leave the flowers well alone, because those flowers are exactly what becomes the harvest.