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What to Do in the Vegetable Garden This June

Published on June 6th 2020
A close up of a flower
June marks not just the middle of the year but also time to harvest important crops.
Tasty broad beans, new potatoes, asparagus, salads, fresh onions and herbs should now be on the way to the kitchen! Add to this gooseberries, rhubarb and the tastiest first strawberries and, if you forgive the pun, we are beginning to enjoy the fruits of our labours!
Find what to grow in the garden this month in the collection:
A close up of a flower

What to do in the garden in June


A handful of new potatoes
  • First, early potatoes should be ready for lifting now! If flowers are showing and the leaves are starting to go yellow, that's a sure sign that there are big enough tubers underneath to lift. Take them straight to the kitchen, boil them with a spring of fresh mint and serve with lashings of butter!
  • Maincrop and second early potatoes should never run short of moisture at this time of their development. The new tubers should be forming this month and will respond well to a thorough watering. They respond best if you water when the little tubers are the size of an egg.
A row of potatoes in a garden
Ensure that your main crop potatoes are well earthed up to avoid the tubers becoming green from exposure to light.
Pumpkin seedlings in pots
  • Plant out pumpkins and squashes: these love well-rotted manure or good garden compost.
  • Sow more French beans and mange-tout peas. Like salad crops, these both benefit from sowing in succession.
Pot marigolds and peas on a garden fence
  • Plant out borage, dill, pot marigold, coriander and other annual herbs. They often resent being planted too early. Basil will prefer a very sheltered spot, and I grow mine between my tomatoes in the greenhouse. Then a few leaves can be gathered to go with the tomatoes as I pick them.
  • Plant outdoor varieties of tomatoes, ridge cucumbers -, courgettes and marrows. Choose the sunniest and most sheltered spot that you have and enrich the soil with plenty of compost.
Make sure to feed your tomatoes every two weeks:

Fruit trees and bushes

  • Mulch strawberry fruits as they develop. Straw is useful if you can get it. Remove unwanted new runners or 'lay' some of them into the rows to root to form a continuous row.
  • Net soft fruit canes and bushes to protect from birds.
Powdery mildew on apple shoots
  • Some apple trees may be showing early signs of powdery mildew. Prune out these first 'primary infection' shoots as they have carried infection over the winter and infect new shoots.
  • Spray your apples with Sprayday Greenfly Killer to stop codling moth grubs boring into your fruit. Pheromone traps, now widely available, give good non-pesticide control but need to be installed early enough to get control.
Find alternatives to pesticides here:
  • Make sure newly planted fruit canes and bushes are always well watered.
  • Earliest gooseberries should be ready now. If you leave some fruits to ripen, they will grow larger and taste sweeter.
  • Stop harvesting forced rhubarb crowns now to give them time to recover. Those you haven't forced should produce a harvest for another 4-6 weeks.

Protected growing

Red Spider Mite infestation of Aubergine
  • It is usually at this time of year that whitefly and red spider mite populations in the greenhouse explode. Before that happens, order some natural predators to control these difficult pests the natural way. Especially watch out for it on cucumber and aubergine plants.
  • If greenhouses are getting too hot, paint 'Coolglass' on the outside to reflect the heat of the sun. This is easily wiped off in autumn. Wetting the floor regularly will also lower the temperature, but don't do it late in the day!
  • Ventilate your greenhouse regularly. If it is still too hot inside, keep the doors open.
Tomato fruits
  • Regularly remove side shoots from tomato plants - unless you have a bush variety- and gradually increase watering and ventilation as they grow bigger and the days get warmer. Support plants well and gradually remove the lower leaves as they turn brown.

The container garden

A vegetable pallet garden
  • Plant herbs in containers to have fresh herbs near to hand when cooking. Any container will do as long as it has good drainage and that you fill it with good potting compost. Try thyme, chives, parsley, tarragon and pot marjoram.
  • Avoid planting mint in with these as it can quickly takeover. Grow on its own.
  • Plant outdoor tomatoes, ridge cucumbers, courgettes and marrows. These can all be easily grown in large pots or grow bags on the patio.
Courgettes growing in a grow bag

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