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Your August Garden: Top Tips & Advice

The final month of summer in the garden is one to really enjoy the performance of nature around you, at the same time as offering timely care and maintenance. If you are going away make sure you have a plan in place so you return to your garden in the same good condition that you left it. Read our top tips and advice to August jobs in the garden. Find out what to do this month and have some helpful gardening tips from our Hillier experts to keep your garden at its best.

What to Enjoy in Your Garden in August

Hybiscus syriacus 'Blue Chiffon' will bloom in August — *Hybiscus syriacus ‘Blue Chiffon’*

Being in the garden during August is as much about appreciating the beautiful now as planning and planting for the future. Enjoy these plants in your garden and home during August:

Plants Flowering During August in Your Garden

Climbers: summer-flowering clematis varieties, Hydrangea petiolaris, jasmine, Passiflora
Summer-flowering shrubs: Abelia, Abutilon, Buddleja, Calycanthus, Cotinus, Hibiscus, Hydrangea macrophylla, Hydrangea paniculata, Potentilla
Lavender varieties: Lavandula stoechas (French lavender) and Lavandula angustifolia (English lavender)
Perennials: Acanthus, Achillea, Agapanthus, Alstroemeria, Anemone (late-flowering varieties), Aster, Astrantia, Campanula, Centaurea cyanus (cornflower), Chrysanthemums, Coreopsis, Cosmos, Dahlias, Dianthus, Echinacea, Echinops, Gaura, Gazania, Geranium, Gerbera, Gypsophila, Helenium, Leucanthemum, Marguerite, marigolds, Monardas, Nepeta, Nigella, Rudbeckia, Salvia, Scabiosa, sunflowers, sweet peas, Verbascum
Roses
Summer bedding plants
Alpines: Phlox, Saxifrage, Sedum

Great for Foliage and Structure

Cannas, Cordyline, Cynara, Fatsia, Hostas, Heucheras, Phoenix palms, Phormium, Physocarpus, Sambucus, Tiarellas and Trachycarpus
Ornamental grasses: Miscanthus, Stipa
Ferns: Athyrium, Dryopteris, Matteucia, Osmunda, Polystichum

Houseplants

Flowering now: Begonias, Kalanchoe, orchids, roses

Great for foliage: Adiantum (and other ferns), Alocasia, Chlorophytum, Cordyline, Ficus, kentia, Monstera, Schefflera, cacti and succulents

What to Plant in the Garden During August

rudbeckia in the garden during August — *Plants like rudbeckia bring a welcome burst of colour at the end of summer and flower into the autumn*

While enjoying and maintaining your garden is the priority in August, there are also several plants that can be added now for instant and future impact.

Planting for Instant Impact

Gardening is often about the patient process of growing from seed, bulb or small plant and nurturing it over time. If you want to balance this out with immediate colour, foliage and scale in your garden, you can always find larger plants or those that are in bloom right now for instant impact. Be sure to water newly planted gardens often particularly in the warmer summer months.

Simply browse the ‘flowering now’ list above. Many of these plants will be available from the Garden Centre for immediate enjoyment and once planted should continue to develop year after year. Just remember to water them frequently while they establish, especially over the hot, dry summer months.

What to Plant for Future Interest

Alpines – 1-litre plants allow for a cost-effective garden update
Autumn bulbs start arriving in Garden Centres at the end of August. Although planting should wait until September and beyond, you can start planning what you would like to grow now!

What to Grow in Your August Garden

Tomatoes to be growing in your garden in August — *You should be rewarded with a continuous harvest of tomatoes this month*

In late summer there is an increasingly bumper harvest of fruit and vegetables to pick. Much like the rest of the garden, August is the month to stay on top of your weeding, watering and feeding routine.

Sow Outdoors

There is still time to plant those crops that are either fast-growing or those that will overwinter.

Sow carrots, lettuces, winter spinach, radishes and turnips

Harvest Now

Many herbs improve in growth the more they are used – so be sure to pick and flavour your cooking!

Hillier tip: If you are looking for new recipe ideas, browse our recipe collection from our Hillier Development Chef

Harvest apples, aubergine, beetroot, blackberries, broad beans, broccoli, carrots, celery, cherries, chilli peppers, courgette, cucumber, gooseberries, kale, lettuce, onions, peas, pears, plums, potatoes (second earlies, main crop and salad), radish, raspberries, rocket, spinach, strawberries, sweetcorn, tomatoes

Hillier tip: See the planting and harvesting times for many of our most loved vegetable and salad plants in our Seed Sowing Calendar.

Other Grow Your Own Activities

Be vigilant with weeding! Little and often is the key
Pests such as slugs and vine weevils may be problematic at this time of year. Make sure you have your desired pest control method in place

Hillier tip: Don’t forget to net any brassicas to stop Cabbage White butterflies laying eggs. If you are hoping to encourage butterflies to breed in your garden, read our guide to what to plant to attract butterflies.

Water – lower frequency and higher volume is best
Help deter pests in your vegetable plot by ‘companion planting’

Hillier tip: Planting marigolds in your vegetable patch can deter whitefly and attract ladybirds, which will help to control aphids. They also emit a substance from the roots that deters nematode worms in the soil. Plant nasturtiums alongside your brassicas to attract cabbage white butterflies away from your precious greens. Plant pungent vegetables, such as onions, garlic or chives next to your carrots to deter carrot fly.

Gardening Jobs for August

Plants to Prune

Deadhead faded flowers from almost all of your garden plants to encourage a second flush

Hillier tip: As the first flush of flowers fade on herbaceous plants, cut the flower stems back hard and feed. This will encourage new flower growth to develop.

Deadhead roses frequently as the first flush fades to encourage repeat flowering

Hillier tip: When deadheading roses, cut down to the next outward facing bud and always cut shoots at a side angle. That ensures that water runs over the cut and down the stem

Plants to Feed

Feed roses with special rose feed with high potash as they grow. This will encourage a stronger, healthier flower. Mulch around them after feeding.

Hillier tip: High potash feeds are also ideal for tomatoes and fruit trees as they promote strong fruit production and increased sugar levels, meaning higher yields and sweeter fruit.

Applying a good feed regularly, particularly to containers and baskets, will help keep your garden in full bloom

Plants to Protect

When planting any herbaceous plants that have a tendency to grow floppy, such as taller dahlias, add support as early as possible so they will grow up around it

Lawncare & Gardencare

Top of the list for August is your watering routine, especially if you are planning to go away. Containers may want regularly watering as warm weather and wind can quickly dry soil

Hillier tip: For advice on watering in all areas of your garden, read our Guide to Watering.

Make sure you have your holiday plant care plans in place if you are away for any length of time to make sure they stay at their best.
Install a water butt if space allows to collect and recycle rainwater over the coming year
If you have a pond or water feature, make sure that it’s topped up with water
Keep weeds at bay with a ‘little and often’ approach by spending a few minutes each week to remove weeds from borders and containers
On warmer days open greenhouse vents and doors to keep it cool and ventilated to prevent disease and fungus problems
Regularly mow your lawn. Cutting the grass too short will strip it of vital moisture and nutrients so, if possible keep your blade setting high
Apply a high-nitrogen lawn feed such as Aftercut Ultra Green to keep grass lush and thick

Looking After Birds and Wildlife in August

As the temperature rises the ground becomes harder, making it more difficult for birds to source worms. On hot days, birds need extra water to stay hydrated and maintain a cool body temperature.

Continue to feed regularly with high protein food, like sunflower seeds
Ensure clean water is available. Top up frequently in warm weather

Hillier tip: Read more about looking after our winged friends in our guide to year-round bird care.

Hopefully, butterflies will have been flitting around your garden all summer looking for sources of nectar. August continues to be a key month for butterfly sightings. Look out for Brimstone, Comma, Peacock, Red Admiral, Small Tortoiseshell, Painted Lady, Large White, Common Blue and Speckled Wood.

How you can help

Have plenty of flowers in the garden that offer a late summer nectar source for butterflies – like Buddleja, Dahlias, Erysimum, Geraniums, and Verbena bonariensis
Position your plants where possible in a sunny sheltered location. A window box on a balcony is fine if that is all the space you have available