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. It is important to find time to relax outdoors enjoying your garden’s rich tapestry of colour and fragrance.

Terrace Garden

  • Now that the risk of frost has passed, June is the perfect month to fill your patio containers, hanging baskets and window boxes with vibrant bedding plants to be enjoyed on long summer days spent outdoors. Our stores are fully stocked with an extensive range of quality British grown bedding plants, selected for their excellent garden performance and floriferous display guaranteed to fill your garden with high summer colour. Our in-house planting service means we will be only too happy to plant your container for you, with your chosen selection, ready to go straight onto the terrace if you so wish.
  • If you are looking for a more permanent container planting, maybe a statement piece as a focal point, or to highlight an entrance or seating area, there are various hardy shrubs that perform exceedingly well in containers. Consider Japanese Acers in their beautiful foliage colours for an oriental look, topiary Buxus clipped into balls, pyramids and standards for a classic look, Hydrangea with sumptuously 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 for our extensive range of hardy feature shrubs for year round garden interest.
  • Bedding plants raised from seed or the young plant stage can be planted out now, if not done so already, as can more tropical feature plants such as Canna and ornamental bananas.
  • With all plants grown in containers, water regularly during the summer months, adding liquid fertiliser every fortnight for healthy growth.

Beds and Borders

  • Weeds grow quickly in the warm temperatures. To keep them in check hoe them off before they get chance to establish. Apply a thick layer of mulch over the soil surface to help keep further weeds at bay.
  • Prune spring flowering shrubs, such as Deutzia, Weigela and Philadelphus soon after flowering has faded to prevent them becoming overgrown. Remove spent branches with secateurs or loppers to allow new growth to develop that will carry next springs display. Extend the season of colour with summer flowering shrubs such as lavenders, hardy fuchsias and hydrangeas.
  • By tradition the saying goes that Buxus can be trimmed after Derby day to keep formal hedges and topiary shapes looking crisp. The same applies to all evergreen hedges, but do check for nesting birds and if necessary wait for late fledglings to fly. Consider planting dwarf Buxus to edge herb beds and flower borders for a smart and classic look.
  • Spring flowering annuals, such as forget-me-nots, will have faded now and should be lifted to make way for later summer plantings. Honesty can be left in place, their mother of pearl seed cases adding interest to the winter garden. Fill gaps with fast growing high summer bedding plants such as Dahlia, Cosmos and Nicotiana for accents of colour to last until the frosts of autumn.
  • 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. Use plant supports around tall herbaceous plants or those with large blooms such as paeonia to help protect against damage from wind or rain. Put supports in place as soon as possible and they will 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 as second late season flower display. Mulch and feed for an extra boost. In store we have an extensive range of quality British grown herbaceous plants perfect for adding colour to existing or new borders.
  • Clematis montana can be cut back after flowering to control growth if required. Also, tie in new growth on summer flowering clematis and honeysuckle. In store we have an extensive range of British grown climbers and clematis perfect for adding colour to your vertical spaces. Ideal for growing on walls and fences, or garden features such as obelisks, arches and arbours, either plant on their own or together with a climbing rose or wall shrub for an extended season of colour.
  • Dead-head roses to encourage repeat flowering. Feed 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, the perfect time to chose new varieties to add to your summer display. See in store and online at Dobbies.com for a wide range of quality British grown plants, including highly recommended David Austin Roses for exuberant flowering, fragrance and excellent garden performance.
  • 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 contestant supply of fresh leaves. Or if you prefer, we have a wide range of young vegetable plants available for quicker results.
  • Finish harvesting Asparagus spears this month. Continue to pull Rhubarb stems regularly, stopping later in July to allow plants to build their strength for next year.
  • Protect soft fruit from opportunist birds, Spread nets over soft fruit bushes and tuck straw under strawberries to protect from slugs.


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


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

Plants at their best

Mock Orange
Plantain Lily

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