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What to do in the garden in August

There's always something to be doing in the garden, whether it's pruning, tidying or sowing, so we've put together our top gardening tasks for August.

See what's looking good in the flower garden or vegetable garden this month

What to do in the garden in August

There's always something to be doing in the garden, whether it's pruning, tidying or sowing, so we've put together our top gardening tasks for August.

See what's looking good in the flower garden or vegetable garden this month

Timely Tips

  1. Bird Baths will quickly evaporate or become full of algae growth quick in the summer, remember to clean them out regularly to help our birds during the worst heat

In the flower garden

Keep your Camellias and Rhododendrons well watered at this time of year to ensure that next year's buds develop well.

Keep container plants well watered
Keep container plants well watered

Keep patio container plants well watered and feed with a liquid fertiliser every fortnight.

Stake tall or top heavy Dahlias and Lilies to prevent wind and rain damage.

Dead-head bedding plants and perennial plants to stop them self-seeding and to encourage further flowering into the autumn.

Cut back faded perennials to keep borders tidy.

Dead head Lilies for a better display next year
Dead head Lilies for a better display next year

Dead-head Lilies for a better flower display next year.

As your Penstemon flowers fade, cut them back to just above a leaf to encourage more flowers.

Cut back herbs now to encourage a new flush of tasty leaves you can harvest before the frost.

Prune summer flowering shrubs once they have finished blooming.

Prune your Wisteria after flowering by removing all the whippy side-shoots from the main branch framework to about 20cm from their base (about five leaves from the main stem).

Trim your Lavender
Trim your Lavender

Trim your Lavender plants after they've finished flowering to keep them compact.

Collect ripened seed and store for next year. Leaving some seed heads in place can be attractive and allows the plant to self-seed in the surrounding soil.

Mow wildflower meadows now to help scatter the seeds.

Take cuttings of your favourite tender perennials such as pelargoniums and fuchsia to propagate them for next year.

Finish dividing clumps of Bearded Iris now so they have time to form roots and flowers buds for next year before the cold weather arrives.

Prune Climbing Roses
Prune Climbing Roses

Prune climbing roses and rambling roses once they've finished flowering (unless they are repeat-flowerers in which case leave them).

Now is a good time to spray ground elder (and other perennial weeds) with a glyphosate-based weedkiller as the plant has lots of leaf surface area with which to absorb it.

Look out for symptoms of Clematis Wilt such as wilting leaves and black discolouration on the leaves and stems of your Clematis. Cut out any infected plant material and dispose of it in your household waste.

feed tomato plants with a tomato fertiliser

In the vegetable garden

Water your vegetable plants and fruit plants daily in warm weather.

Water and feed your Sweetcorn
Water and feed your Sweetcorn

Water sweetcorn plants regularly now and feed with tomato food  to get the best cobs.

Apply a high-potash fertiliser such as tomato food once fruits start to form on peppers, cucumber and aubergines.

Feed Tomato plants with a tomato fertiliser and pinch out the tops

Continue to feed tomato plants with a tomato fertiliser and remove leaves lower down on the plant to help with air cirulation and prevent disease.

Pinch out the top of tomato plants to concentrate the growth into the fruit that has already formed. Aim to leave 5 or 6 trusses of fruit per plant.

Cut back herbs now to encourage a new flush of tasty leaves that you can harvest before the frost. Dry or freeze your herbs to use in the kitchen later on.

Thin parsley to 25cm between plants so it can establish a good root system before winter.

Pinch out the tips of your runner bean plants once they reach the top of their support. This encourages side-shooting and more beans at a manageable height for picking.

If you're growing aubergines pinch out the growing tip once they have 5 or 6 fruits. Pick fruits while they are young and shiny.

Limit the fruits on a squash plant to about three, but make sure these fruits are established before pinching out the surplus.

Harvest Spring sown Carrots
Harvest Spring sown Carrots

Spring-sown carrots and beetroot will be ready to harvest now although they can be left in the ground to keep growing.

Continue to harvest second early potatoes now - perfect for salads!

Start harvesting your maincrop potatoes as the leaves yellow and die back. Try storing your potatoes in hessian sacks which exclude light but allow adequate ventilation.

Sweetcorn is ready when you can pop a corn with your thumbnail and the juices are milky.

Lift and dry onions, shallots and garlic once the foliage has flopped over and yellowed. Store them in onion bags to prevent moulds developing.

Harvest French and Runner beans
Harvest French and Runner beans

Harvest french and runner beans little and often to prevent them from setting seed.

Pick runner beans regularly to prevent them becoming stringy and to make room for developing pods. Leaving mature pods to set seed can prevent further flowers developing and reduce your crop.

Keep harvesting courgettes before they become too big!

Take cuttings of herbs such as rosemary, sage or mint now to bulk up supplies. Put cuttings in moist, well-drained potting compost (one part grit to one part compost) and place in a cold frame.

Established clumps of chives can be divided now.

On a dry sunny day, collect seeds of herbs such as dill, fennel, caraway and chervil and dry in a warm spot out of direct sunlight. Chervil must be sown immediately.

Keep an eye out for Potato blight
Keep an eye out for Potato blight

Keep an eye out for potato and tomato blight and remove and destroy any affected plants immediately to prevent its spread. Read our 'How to stop blight' guide for more information

Check for cabbage white butterfly eggs under brassica leaves and squash any that you find. Alternatively use nematodes to kill the caterpillars.

Clear away any diseased and spent foliage on and around your veg plants to discourage pests and diseases spreading.

Keep on top of weeds as they compete with your crops for nutrients and water.

In the fruit garden

Feed your fruit trees in containers a high potash liquid feed
Feed your fruit trees in containers a high potash liquid feed

If you have plants fruiting in containers, make sure you give them a high potash liquid feed to keep plants healthy and productive.

Remember to feed your lemon tree (and other citrus fruit trees) throughout summer with a special citrus fertiliser.

Plant out any rooted runners of strawberries for a good crop next year.

Keep birds and squirrels off your berries with netting or old net curtains.

Protect your crops with a bird scarer made from CDs tied to strings.

Harvest your fruit tress
Harvest your fruit tress

Harvest your fruit trees - cherries, plums, peaches, nectarines and apricots should all be ripe now! Early varieties of apple trees will be ready towards the end of the month.

If you have a glut of autumn raspberries, blackberries or loganberries, freeze them on trays for a couple of hours and then bag them up to use over winter.

Tidy up strawberry plants and remove any old straw from around the plants to improve ventilation and reduce the risk of pests and diseases.

Prune the fruited stems of your blackcurrant bushes after harvesting.

Cut back the fruited canes of your summer raspberries, leaving the new green canes for next year's crop. Tie in next year's raspberry canes to support wires or fencing.

In the greenhouse

Use blinds to prevent over-heating
Use blinds to prevent over-heating

Check plants daily and water them if the soil is dry.

Damp down your greenhouse on hot days to increase humidity and deter red spider mites.

Open vents and doors on warm days.

Use blinds or apply shade paint to prevent the greenhouse from over-heating in sunny weather.

Try hanging sticky traps to catch flying pests and help determine which pest control is needed.

Tidy up fallen leaves and flowers to discourage disease.

Looking after your lawn

Don't worry if your lawn is looking brown, the autumn rains will soon make it green again.

Don't feed your lawn with a high-nitrogen fertiliser now as this will encourage lots of lush new growth which is easily damaged by autumn weather.

Lawn growth slows down in late summer so raise the cutting height of your lawn mower to help the grass cope.

If you're planning on laying a new lawn this autumn, prepare the area now to give it time to settle. This also allows weeds to germinate so you can clear the area thoroughly before planting.

Recut any lawn edges if needed. Try installing lawn edging to make future maintenance easier.

If your lawn is infested by ants, brush out the nests on a dry day. Always brush them away before mowing.

Other jobs about the garden

Hedges can be given a final trim now before they stop growing.

Water plants thoroughly when needed instead of every day. Thorough watering supports plants for up 14 days, while merely wetting the surface wastes water, encourages weeds and can lead to surface rooting making the plants more vulnerable.

Collect valuable rainwater
Collect valuable rainwater

Use water butts as much as you can to water your plants.

Recycle your water - collect washing up water in a bucket outside for watering beds and lawns

Turn the compost in your compost bins every month to keep it well aerated and to speed up decomposition.

Keep bird baths topped up in hot weather.

Scoop floating weed and algae from ponds. Try using Pond Wizard to clear your pond effectively.

Remove rampant bulrushes or irises from your pond before they go to seed and make the problem worse.

Now is a good time of year to treat lawn chafers and leatherjackets with nematodes.

Keep an eye out for white powdery mildew on plants. If possible, remove the affected parts and spray with a fungicide to prevent further spread.

Keep an eye out for aphids under leaves
Keep an eye out for aphids under leaves

Look for aphids on the underside of leaves - rub them off by hand or spray with an insecticide to prevent them multiplying. Alternatively try using a natural pest control such as Lacewing larvae.

Keep an eye out for scarlet lily beetles on your lilies - remove and crush any you see. Also check for the sticky brown larvae on the underside of leaves.

If your plants are wilting check for vine weevils by tipping your plants out of their pots and looking for 'C' shaped creamy maggots amongst the roots. Treat with nematodes if vine weevils are spotted.

Prevent slugs attacking your young plants by using nemaslug.

Use boiling water as a weed killer on your paved areas. Weeds wilt and die within a few days.

From your armchair

Order plants for Autumn Delivery
Order plants for Autumn Delivery

Make rough sketches of your flower borders and vegetable plot to help plan for next year.

Take photos of your garden as a reference point
Take photos of your garden as a reference point

Take lots of photos of your garden now if you want to rearrange it in winter - it's much easier to do this if you have a reference point.

Think about which bulbs you would like for next spring - now is the time to order ready for autumn planting.

Order your perennial plants online now ready for autumn delivery.

What's looking good in the flower garden in August

What's looking good in the vegetable garden in August