6. Things to do in June

Kitchen Garden

  • Feed fruit & vegetables with liquid fertiliser.
  • Carefully water new salad & seeded plots.
  • Thin fruit – especially apple & plum trees – for bigger fruit & improved crop quality.
  • Regularly remove side-shoots on cordon tomatoes & tie plants to supports.  Ensure on cordon tomatoes that their main stem is well-supported.
  • Feed tomatoes regularly.
  • Harvest early peas & prepare for a late sowing of an autumn crop.
  • Water potato plants for good sized tubers and reduced problems.
  • Protect soft fruit from attack by birds by netting securely
  • Check gooseberry bushes for sawfly larvae.  Start summer pruning of gooseberries, shortening the current season’s growth back to five leaves, and prune out and dispose of any shoots affected by gooseberry mildew.  (RHS, The Garden, June 2018, p.29)
  • Pinch out tips of figs at the end of June, once shoots have made five leaves.

 

Plant-out tender vegetables 

  • Finish transplanting indoor-grown cucumbers, squash, zucchini & pumpkin.
  • Plant out tender potted pepper plants.
  • Plant out tender aubergine.
  • Tomatoes  –  feed regularly with a high-potassium fertiliser
  • Leeks when pencil-thick into 15cm (6″) deep holes & water well.

 

Sow Directly into prepared ground (Early June)

  • Succession-sow small quantities of salad greens and herbs every 2-3 weeks for continuous picking – eg leaf lettuces, rocket, coriander, dill and basil 
  • Sow at 2 week intervals salad leaves & annual herbs such as dill and coriander.
  • Direct-sow carrot cultivars such as ‘Chantenay’ for autumn & winter harvesting (‘Autumn King 2’).
  • Sow courgettes (zucchini).
  • Florence fennel sown now is less likely to bolt than earlier sowings.
  • Squash & pumpkin.
  • Continue direct-sowing runner beans & French beans
  • Sow fennel & oriental greens such as mizuna & pak choi – sowing now helps reduce the risk of bolting
  • Grow lettuce, salad leaf crops & radish to fill gaps between slow-maturing vegetables such as brassicas.
  • Sow sweet corn.

 

Harvest

  • Early peas
  • Harvest summer radish, salad onions, salad leaves, and broad beans.
  • First, second and salad potatoes may be ready for harvest.

 

Flower / Ornamental Garden: Maintenance

  • Divide bearded irises after flowering – replanting sections with at least 2 fans of leaves attached.
  • Stake herbaceous perennials – like lilies and tall plants such as delphinium.
  • Stake summer flowering bulbs such as gladioli.
  • Remove suckers from ornamental trees and roses.
  • Tie-in climbing & rambling roses as horizontally as possible to encourage better flowering.
  • Deadhead flowers – eg delphinium & lupin – to encourage a second flowering.
  • Remove flowerheads from euphorbias, pruning to ground level to encourage strong new growth.   Euphorbia sap can cause skin irritation and is sticky.
  • After flowering, cut back oriental poppies for a fresh rosette of growth.
  • Prune spring- & early-summer flowering shrubs – eg philadelphus (mock orange).
  • Weed regularly and dig out roots of perennial weeds – eg bindweed.

 

Flower / Ornamental Garden: Sowing & Planting 

  • Sow for summer colour: there is still time to sow quick-germinating annuals such as cosmos – for flowers lasting well into autumn.
  • Sow: winter flowering pansies.
  • Sow: biennials such as wallflowers & foxglove to flower next year.
  • Plant: Finish planting summer bedding plants and tender perennials.  For example, fill gaps in flower beds with long-flowering summer bedding plants – eg cosmos & lobelia.  
  • Thin direct sowings of hardy annuals & biennuals – eg calendula
  • Protect flower beds from slugs and snails – espc lilies, delphinium and hostas
  • Treat invasive weeds – eg bindweed, ground elder – by applying glyphosate gel to their leaves.

 

Cuttings

  • Take softwood cuttings from tender plants such as fuchsia and from deciduous shrubs such as buddleja, hydrangea and lavandula.  Also suitable for cuttings: spiraea, caryopteris
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