By midsummer, many gardeners are still reaching for the fertiliser every week. But feeding every plant throughout the season isn’t always the best approach.
Some plants have already finished their main period of growth and don’t need any more encouragement. Others, however, still have weeks of flowering ahead and can really benefit from one final feed.
Knowing the difference helps plants stay healthier and avoids wasting fertiliser.
Stop Feeding Spring-Flowering Bulbs
Once the foliage of spring bulbs such as daffodils, tulips and crocuses has naturally died back, there’s no benefit in continuing to feed them.
At this stage, the bulbs have already stored the energy they need for next year’s flowers and have entered dormancy.
Instead, allow the foliage to die back completely before clearing it away and leave feeding until growth resumes next spring.
Stop Feeding Bearded Irises
Bearded irises have usually finished flowering by now.
Once the display is over, focus on dividing overcrowded clumps if needed rather than applying more fertiliser. Excess feeding, particularly with nitrogen-rich products, encourages lush leafy growth instead of stronger flowering.
Good drainage and plenty of sunshine are far more important than extra feed at this stage.
Give Roses One Last Summer Feed
Repeat-flowering roses are still working hard.
If you’ve been deadheading regularly, a final summer application of a rose fertiliser can help support another flush of flowers later in the season.
After this, avoid further feeding so that plants can gradually slow down and prepare for autumn.
Feed Dahlias While They’re Still Flowering
Dahlias are only just getting started in many gardens.
Regular feeding with a high-potash fertiliser helps support continuous flowering through late summer and into autumn. Combined with frequent deadheading and watering, this keeps plants producing new blooms for as long as possible.
Stop feeding once flowering comes to an end.
Keep Feeding Hanging Baskets and Containers
Plants growing in containers quickly use up the nutrients available in their compost.
Petunias, calibrachoas, bidens, bacopa and other bedding plants usually benefit from continued feeding throughout the flowering season.
Regular liquid feeds help replace lost nutrients and keep displays looking colourful until the first frosts.
Continue Feeding Tomatoes and Other Fruiting Crops
Tomatoes, cucumbers, peppers and chillies still need plenty of energy while they’re producing fruit.
A tomato fertiliser that’s high in potassium supports flower production, fruit development and ripening.
Keep feeding according to the product instructions while the plants remain productive.
Avoid Feeding Trees and Shrubs Late in the Season
Most established trees and shrubs don’t need regular feeding by late summer.
Applying high-nitrogen fertilisers too late in the growing season can encourage soft new growth that may not harden off before colder weather arrives.
Instead, concentrate on watering during prolonged dry spells and apply organic mulch when conditions are suitable.
A Simple Mid-Summer Feeding Checklist
As the season progresses:
- Stop feeding dormant spring bulbs.
- Avoid feeding bearded irises after flowering.
- Give repeat-flowering roses one final summer feed.
- Continue feeding dahlias while they’re blooming.
- Feed hanging baskets and containers regularly.
- Keep feeding tomatoes and other fruiting vegetables.
- Avoid encouraging unnecessary late growth on established shrubs and trees.
A small adjustment to your feeding routine now can make a noticeable difference later in the season.
Final Thoughts
Not every plant benefits from the same feeding schedule. While some are winding down for the year, others are entering their most productive period.
By stopping fertiliser where it’s no longer needed and giving flowering plants and fruiting crops one last boost, you’ll help your garden make the most of the weeks ahead without encouraging unnecessary late-season growth
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