News

Flowers

Sowing and planting

Autumn-flowering bulbs, such as autumn crocuses, ColchicumSternbergiaAmaryllis and Nerine, can be planted now.

Some seeds are best planted just after collection, and others may need specific climatic conditions to break dormancy (e.g. some alpines). If unsure, then sow seeds in ‘batches’, i.e. one immediately after collecting, one in winter, and one in the following spring.
Cutting back, pruning and dividing

Cutting back plants in baskets followed by feeding can encourage new growth and help revive tired displays.

Cut back delphiniums and geraniums after the first flush of flowers to encourage a second flowering period. Feed after cutting them back.

Deadhead flower borders regularly to prolong flowering. Disbud and dead-head dahlias if growing for large blooms. Leave roses that produce attractive hips.

Divide clumps of bearded iris.

Plants with a carpet-like growth habit, e.g. some alpines, can become patchy, with central areas dying off. These patches can be in-filled with gritty compost, to encourage re-growth.

Propagation

Take cuttings of patio and container plants ready for next year.

Repot snowdrops if growing in containers.

Pinks and carnations that have become leggy, can be propagated by layering or by cuttings. Propagation can improve the appearance of untidy clumps.

General maintenance

Prop up tall perennials such as lupins, delphiniums and gladioli if staking was neglected earlier in the season.

Liquid feed containerised plants and keep well watered in dry spells.

Some late-flowering border perennials may benefit from a quick-acting feed before they come into bloom, especially if the soil is not very fertile.

Mulching borders can help retain moisture, and keep down the weeds - this will save a lot of work. A really thick layer of mulch (5-7.5cm/2-3in all over) works best.

Most perennial weeds are best dealt with in the summer when the weeds are in active growth. Digging out often works, but applying a weedkiller can be more practical, particularly for large areas.

Planning ahead

Start collecting seed from plants you want to grow next year, especially annuals such as Calendula, poppy and love-in-a-mist.

Pest and disease watch

Inspect lilies for the scarlet lily beetle whose larvae can strip plants in days.

Vine weevils can also be a problem at this time of year.

Small holes and tears in new foliage of ornamentals such as CaryopterisFuchsia and Dahlia are most likely caused by capsid bug damage.

Watch out for aphids (greeenfly and blackfly) on stems and leaves of young shoots.

Sudden collapse of apparently healthy clematis, especially the large-flowered cultivars, could indicate clematis wilt.

Check Clematis for slugs including ring damage.

In dry weather powdery mildew can play havoc with plants such as clematis, roses and Lonicera.

Look out for and treat black spot on roses and scab on Pyracantha.

Ponds

Top up ponds and water features if necessary - a spray attachment on the hose will aerate the water, and help the fish.

Any pumps on water features should be left on during sultry nights, as oxygen levels are lower in such conditions.

Remove dead foliage and blooms from waterlilies and other aquatic plants. Cut back any marginal plants that are getting out of hand. Continue to skim blanket and floating weeds.

Troubleshooting

Cover ponds with nets or safety grills in gardens where young children play. These have the additional advantage of preventing leaves falling into the pond.

Clean out debris lurking in the depths of the pond. This will improve the water quality and prevent excess debris from promoting the growth of weeds, algae or marginal plantings, and from releasing toxins that could harm fish or wildlife.

Structures

Take advantage of dry weather to catch up on painting and preserving jobs - sheds, fences and garden furniture are all regularly in need of a new coat.