What to do during June in your garden and greenhouse.

Your monthly gardening checklists

Flowers

Plant marginal plants around your pond

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Fruit and veg

  • Plant out sweetcorn after hardening off, arranging plants in blocks to aid pollination
  • Cover developing and ripening fruits with netting or fleece to protect them from birds
  • Enjoy the last harvests of asparagus this month, then leave the ferny top-growth to grow up over the summer
  • Spread mulch around thirsty crops such as beans and courgettes to hold in moisture around their roots
  • Check for woolly aphids on fruit trees, and treat infestations with soap-based spray
  • Water vegetables and fruit in containers regularly, especially during dry sunny weather
  • Go on regular snail hunts, especially on damp evenings, to reduce populations
  • Tie in new shoots of blackberries, raspberries, loganberries and other cane fruits
  • Apply tomato feed regularly to fruiting veg crops, including tomatoes, courgettes, pumpkins and chillies
  • Plant up an edible hanging basket with trailing tomatoes and herbs, and keep it well watered all summer
  • Rejuvenate chives by cutting the clump down to the base, for a fresh crop of new leaves in just a few weeks
  • Water beans and peas as they start to flower
  • Pull out any raspberry canes sprouting up out of their dedicated area
  • Take softwood cuttings of herbs such as marjoram and sage, plant in gritty compost and place on a sunny windowsill

Plant sweetcorn in blocks to aid pollination

Greenhouse

Water tomatoes regularly to void splitting and blossom end rot.

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House plants

  • Start feeding houseplants once a week with liquid fertiliser, continuing through to autumn
  • Water your house plants more regularly as the temperatures warm and light levels increase, check the soil before watering. Take a look at our guide to watering house plants
  • Repot any houseplants that have become top heavy or pot bound into larger containers
  • Ensure house plants are not getting scorched by summer sunshine. Either move further from the window or choose house plants that will thrive in a sunny spot
  • Some house plants, like snake plants, are particularly prone to collecting dust on their leaves. So be sure to give these a wipe regularly
  • Put houseplants outside for the summer in a warm, sheltered spot to enjoy the fresh air and extra light
  • Take leaf cuttings from houseplants, including African violets, begonias and Cape primroses
  • Check your house plants for pests like aphids, scale insects, thrips and mealybugs

For more house plant advice and inspiration visit our Growing and caring for house plants page

Garden maintenance

Prune privet hedges every 6 weeks

Prune privet hedges every 6 weeks

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Gardeners' World December 2025
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