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Gardening Tips for June

Now that summer is finally here and daylight hours are at their longest, the garden will be putting on an exuberant burst of growth and flower. This is a great month to find time to relax outdoors, enjoying your garden’s rich tapestry of colour and fragrance.

Terrace Garden

  • June is the perfect month to fill your patio containers, hanging baskets and window boxes with vibrant bedding plants. Our British-grown bedding plants, selected for their excellent garden performance and floriferous display, are guaranteed to fill your garden with high summer colour.
  • For a more permanent container plant consider Japanese Acers in their beautiful foliage colours for an oriental look or topiary Buxus clipped into balls and pyramids. Hydrangeas offer large flower heads which hold their own well into the autumn, or Cordyline with its bold architectural form and eye-catching foliage.
  • See in-store and online for our extensive range of hardy feature shrubs for year-round garden interest.
  • Bedding plants raised from seed, or at the young plant stage, can be planted out now, if you haven’t done so already, as can more tropical feature plants such as Canna and ornamental bananas.
  • Water all plants grown in containers regularly during the summer months, adding liquid fertiliser every fortnight for healthy growth.

Beds & Borders

  • Keep weeds in check by hoeing them before they get the chance to establish. Apply a thick layer of mulch, such as bark or garden compost, over the soil surface to keep weeds further at bay.
  • Prune spring flowering shrubs, such as Deutzia and Weigela soon after flowering has faded to prevent them becoming overgrown. Remove spent branches with secateurs or loppers to allow new growth to develop as this will carry next Spring’s display.
  • Trim Buxus and evergreen hedges but remember to check for nesting birds and, if necessary, wait for late fledglings to fly.
  • Spring flowering annuals, such as forget-me-nots, will have faded now and should be lifted to make way for later summer plantings. Fill gaps with fast growing high summer bedding plants such as Dahlia, Cosmos and Nicotiana.
  • Water newly planted shrubs and perennials in dry periods, mulching well to help retain moisture.

Cottage Garden

  • In June, the cottage garden border is full of exuberant growth and colour. Make sure plant supports are in place and they’ll soon be disguised by fresh new growth.
  • Take action to protect susceptible lush foliage of prized herbaceous plants, such as Delphinium and Hosta, from slug damage.
  • Early season herbaceous plants, such as hardy Geranium and oriental poppies can be cut back after flowering to encourage re-growth of tidy, fresh new foliage. Geraniums will often put on a second, late season flower display. Mulch and feed for an extra boost.
  • Clematis montana can be cut back after flowering to control growth if required. Also, tie in new growth on summer flowering clematis and honeysuckle.
  • Dead-head roses to encourage repeat flowering. Feed them with rose fertiliser and add a layer of mulch for an extra boost to support strong growth and a floriferous display. Roses are at their peak in June, making it the perfect time to choose new varieties to add to your summer display
  • Sweet Peas are growing strongly now. Use garden twine to tie-in growths to their supports. Once established, they will climb happily by themselves.
  • Thin out seedlings of hardy annuals sown directly into the soil, allowing each plant room to develop to its full potential.

Kitchen Garden

  • Continue to earth up main-crop potatoes, to avoid tubers being exposed to the light and turning green. Early potatoes will be ready for harvesting soon, maturing around 10 weeks from planting.
  • Plant out courgette and squash plants once all risk of frost has passed.
  • Pinch out the side shoots of tomatoes to concentrate energy into fruit formation. Once the first trusses start to set fruit, begin feeding weekly with tomato fertiliser.
  • Re-sow salads every 10 to 14 days for a constant supply of fresh leaves. Or if you prefer, we have a wide range of young vegetable plants available in-store for quicker results.
  • Finish harvesting Asparagus spears this month. Continue to pull Rhubarb stems regularly, stopping later in July to allow plants to build up their strength for next year.
  • Protect soft fruit from opportunistic birds. Spread nets over soft fruit bushes and tuck straw under strawberries to protect from slugs.

Lawn

  • Regular mowing is best way to a healthy lawn, reducing the cutting height now that the grass is growing more strongly.
  • For a lovely, lush green lawn, apply a high nitrogen summer feed

Greenhouse

  • Apply shading to greenhouses to prevent over-heating or scorching of tender plants, and keep them well ventilated on hot sunny days.
  • Acclimatise bedding plants, grown from seed or at the young plant stage, over a period of 7 to 10 days before planting out.

Conservatory Garden

  • Citrus and some larger foliage plants such as Yucca can be moved outside for the summer once all risk of frost has passed.
  • Repot houseplants showing signs of being rootbound. Top dress larger plants with fresh compost.