Greenhouse calendar - June
June is the month when gardeners can breathe a sigh of relief now that the danger of frost has passed. With the longest day a few weeks off light levels are at their highest, so plants will put on lots of growth over the coming weeks.
In the greenhouse:
- Help pollination of tomatoes and chillies by gently shaking the flowers each day.
- Remove side-shoots on cordon tomatoes.
- Keep plants in the greenhouse, those growing in containers and vegetable and fruit crops watered.
- Start to feed plants in containers once a week with a dilute tomato fertiliser or comfrey feed. These are high in potassium which encourages flowers and fruit to form. For leafy vegetables use seaweed fertiliser.
- Install shade netting or apply a shade paint to your greenhouse to avoid damage to plants caused by intense sunlight.
- Ventilate the greenhouse to lower temperatures and hose down hard surfaces inside, a technique known as damping down, which increases the humidity, helping plants cope with the heat.
In the garden:
- Pick sweet peas to keep more flowers coming.
- Keep the bird bath topped up during hot weather so that birds have somewhere to drink and bathe.
- Make comfrey fertiliser by cutting some leaves and adding them to a bucket of water. Cover and leave to stand for a few weeks before decanting. Dilute it before feeding fruit crops and dahlias.
- Sow biennials such as forget-me-nots, honesty and wallflowers for flowers next spring and summer.