Relax, it’s summer…picture by Merv French
August can be a bit of a ‘graveyard’ month – few things are looking good in the garden as the first flushes of growth on many plants have died or been pruned away and there’s not much (yet) to replace them. It can be one of the hottest, driest months in the UK, too, making watering essential – and this could be a problem if you’re on holiday and don’t have friends or neighbours (or an automatic watering system) to do it for you. So this month’s tips are mainly about harvesting, maintaining colour and interest, pruning and propagating new plants – and of course, watering!
1. Prune now for next year’s fruit and flowers
To encourage flowering or fruiting shoots, prune early flowering shrubs if not already done so and also trim back the new straggly stems of Wisteria to about 5 or 6 buds above the joint with the main stem – this will encourage energy to go into forming new flowering spurs. Do the same for fan or other trained fruit like plums, cherries a etc. Cut out the old fruiting stems of summer raspberries to encourage the new stems to grow and tie these in as you go to stop them rocking around too much. Sever, lift and pot up strawberry runners if you want to replace old plants or expand your strawberry bed. Trim back your lavender once it has finished flowering, to stop it growing leggy (but just the tops- don’t cut into old, woody stems).
2. Cut out the dead or diseased
Dead head and ‘dead leaf’ perennials and annuals to prolong flowering as long as possible and keep plants looking tidy. Cut back herbs (Chives, Chervil, Fennel, Marjoram etc.) to encourage a new flush of tasty leaves that you can harvest before the first frost. Dry or freeze your herbs to use in the kitchen later on or sow some in pots that you can bring inside later in the year. 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.
Clematis wilt
3. Water when necessary
Containers, hanging baskets and new plants in particular need a regular water and some will need to be fed too. Ideally use stored rainwater or ‘grey water’ (recycled from household washing, but only that without soap and detergents etc.). Keep ponds, bog gardens and water features topped up. Particularly thirsty plants include:
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Phlox
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Aster
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Persicaria
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Aconitum
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Helenium
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Monarda
4. Mulch
To conserve moisture in the soil around plants use a mulch of organic material. An easy option is grass clippings – put these on a plastic sheet and leave for a day in the sunshine. Turn the pile of clippings and leave for another day, or until they have turned brown. Spread the mulch round each plant, but avoid covering the crown as you might encourage it to rot. As mulch attracts slugs avoid those plants that these pests enjoy – Hostas, Delphiniums etc. Check that any mulch applied earlier hasn’t decomposed and add more as needed. Ideally, spread a mid-season layer of compost or manure – this will act to conserve moisture and feed the plants too.
Harvest Sweet corn this month
5. Harvest home
Pick vegetables such as Sweet Corn. 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. If you’re going away ask a neighbour / friend to pick your flowers, salad and veg to prevent everything running to seed in your absence.
6. Last chance saloon
In the early part of the month sow your last veg for autumn/ winter harvesting (e.g chard or spinach). You can also sow salad leaves under cover in warmer areas. And sow green manures in ground that is going to be left vacant for a few months so as to help maintain nutrient levels and to keep weeds down.
7. Think seeds
Gather seeds from plants you want to propagate in this way and store them/ seed heads in paper bags if it’s not yet ripe. And why not allow some self seeding in some areas? Mow wild flower meadows to allow seeds to spread for next year.
Divide Bearded irises to give the divisions time to establish
8. Divide to multiply
If the weather and soil conditions allow, start dividing perennials, perhaps beginning with bearded Irises. Either replant the divisions in the garden or pot them up for later sales/swaps/gifts.
9. Cut to grow
Take cuttings, an excellent way of increasing your woody and semi-woody plants like fuchsias and pelargoniums. Choose a healthy shoot and cut the top six inches, then remove all but the topmost leaves. For insurance, dip in a little rooting powder and place in moist compost. Keep them in a cold greenhouse from September and plant them in their positions next spring, when there is not much chance of heavy frost.
August is a good time for taking Fuchsia cuttings
10. Enjoy and inspect
Spend a good amount of time in the garden enjoying it – asleep, with friends or just admiring what you and mother nature have created! And while you’re at it make notes / take photos of your borders etc. to identify any problem areas that need sorting out for next year; overcrowded groups of plants, gaps, areas lacking colour or interest, weak looking plants etc. And it’s also important to record good plant combinations you might want to repeat – or just take pictures of those good looking areas for the record.
Old School Gardener
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As flowers go over be sure to deadhead regularly where appropriate to encourage longer flowering on into the Autumn and generally prevent the garden from looking frazzled and messy.
Collect seed pods for those plants that you’re planning to re-seed, and those that you don’t want to reseed themselves.
Prune back your pleached fruit trees, leaving 3 or 4 leaves on each sideshoot. If any of your other fruit trees need pruning, do this immediately after you have harvested.
Trim back your lavender once it has finished flowering, to stop it growing leggy.
Although weeds will be growing more slowly than in the spring, it’s an idea to continue to hoe the soil to keep them down. This should be done in warm, dry conditions to ensure any weed seedlings left on the surface dehydrate and die.
If you’re going away ask a neighbour / willing family member to pick your flowers, salad and veg to prevent everything running to seed in your absence.
Now is the time to look at your borders and note any gaps / congestion that you’ll want to rectify later in the season when everything has gone over, ahead of next year. And start your shopping list for Autumn bulbs.
And of course, at this time of year, watering is key. Keep on top of this daily, making sure you water in the morning or late afternoon-evening to prevent the heat evaporating all the water before it reaches the plant roots.
Grow Your Own
Flowers
Support your dahlias, lilies and gladioli with stakes and flower rings to ensure the weight of their beautiful flower doesn’t cause their stems to break.
Chrysanths will benefit from being pinched or sheared back, encouraging more growth and flowers.
Keep picking your cut flowers to encourage more blooms and a longer flowering season.
Towards the end of August you can start planning next year’s colour by sowing your hardy annuals.
Grow Your Own
Veg and Salad
Plant out your leeks and brassicas if you haven’t already, and you can also squeeze in a final sowing of spinach and chard in the first couple of weeks of August.
Sow salad leaves under cover, or out in the open if in warmer parts of the UK.
Herbs
Sow Basil, Marjoram, Borage, Chervil, Chives, Coriander, Dill, Parsley in pots outside, to make moving them indoors as easy as possible in the late autumn
Fruit
Transplant strawberry runners to a new position.
Ensure that your fruit crops aren’t pinched by the birds by covering with netting, ensuring the netting stands well clear of the fruit.
Harvesting Food – What you could be picking and eating this time next year, or – if you’re an old hand – already are
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Old School Garden 
We divide a bit later, just so that the new plants are not put out too long before the rain. Also, most of the pruning is winter pruning. Wisteria and the like are of course the odd exceptions.
Very helpful advice re the wisteria – I will be getting the ladder out – only one flower in 10 years so far 😦
Good! I have a young seedling that is just about ready to be given it’s summer coaxing! 🙂