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June garden planner


What to do in your garden in June

What to do in your garden in June

Maintain

  • Mow the lawn regularly to encourage healthy growth.
  • Pinch out sweet peas to encourage bushy growth and use sweet pea rings to secure stems to wigwam.
  • Deadhead roses to promote further flowers.
  • Remove rose foliage disfigured with blackspot.
  • Some annuals such as cornflowers might need gentle support and will produce better blooms as a result. Hide twiggy prunings amongst the flowers: they will soon become invisible.
  • Water container and bedding plants daily, and feed flowers weekly with dilute tomato feed. Use dilute seaweed feed for foliage plants.
  • Tie in climbers, keeping stems as horizontal as possible to encourage bud growth along their length.
  • Tie in new fruiting canes of berry bushes.
  • Apply shading to the greenhouse if there is a need to minimise temperature fluctuations in summer.
  • Finish hardening off bedding plants.
  • Move citrus plants outdoors for summer.

Prune

  • Prune wisteria sideshoots and tie in remaining stems.
  • Trim broom after flowering.
  • Prune shrubs that have already flowered this summer such as philadelphus, weigela, lilac and deutzia.

Prepare

  • This is the month to see roses at their glorious peak. Visit other gardens with roses to help you decide on varieties for your garden. See how they perform. Take pictures and notes.

 

Grow

  • Sow beans every fortnight till end July for successional crops.
  • Sow fennel directly outdoors.
  • In the greenhouse, take pelargonium cuttings for more flowers.
  • Sow runner beans at the base of a trellis panel, archway or even a pergola base. Keep the soil moist and tie the young plants into supports as they grow.
  • Increase your stock of basil by splitting a potful from the supermarket. Turn out the plant and pull it apart gently into several pieces. Repot each of these into a terracotta pot filled with multi-purpose compost. Place in a sunny spot on the patio or on the kitchen windowsill. When you take the leaves, pinch out the tips, which will keep the plant bushy.
  • Sow salad crops every few weeks for regular pickings.

Plant

  • Plant sweetcorn plants outside.
  • Lift and divide established iris clumps after flowering, replanting the rhizomes in fresh soil.
  • If slugs and snails are a problem in your garden, grow strawberries in pots and hanging baskets where they will be less of a target.
  • Finish planting out and potting up tender and exotic plants, such as bananas.

Treat

  • Feed tomatoes, peppers and other fruiting vegetables with a high-potash fertiliser.
  • Spray leaves of fruit trees that have powdery mildew