June 2018 Garden Tips

Garden tips for June


Keep up the hard work to ensure your garden is in bloom all summer.

Once the risk of frost has passed it is safe to plant out all your summer bedding plants into borders, containers and hanging baskets.

Lift and divide clumps of snowdrops and bluebells once the leaves start to yellow.

Remember to deadhead roses if they are repeat-flowering types, to encourage more flowers.

Tie in climbing and rambling roses as near to horizontal as possible. This will restrict sap flow causing more side-shoots to grow along the length of the stem. Therefore more flowers will be produced.

Plant out cannas and dahlias once danger of frost has passed.

Now is a great time for you to plant pot grown lavender. English lavender planted this month will look fabulous towards the end of summer.

Spreading and trailing plants can become patchy. Trimming them back after flowering encourages fresh growth and new flowers.

Euphorbias look a lot better if spent flowers are removed, cutting the flowered stem back to ground level.

Sprinkle fertiliser around perennials, shrubs and roses.

Divide hostas as they come into growth. Divide Primula (primroses) after flowering, planting them in a nursery bed until they are ready for planting out again in the autumn.

Divide bearded irises a couple of weeks after they have finished flowering. Lift plants, break off the older parts of the rhizome keeping the firm pieces. Trim the leaves to just above the fan and replant facing the sun, with the top of the rhizome visible.

Stake tall perennials to prevent wind damage to flower spikes.

Deadhead and cut back oriental poppies after flowering. Cutting them close to ground level will stimulate new foliage.

Train and tie Sweet Peas into their supports to encourage them to climb making a good display of flowers.

Keep tubs, hanging baskets and alpine troughs well watered. Use collected rainwater, or recycled grey water wherever possible.

Keep newly planted trees and shrubs well watered whilst they establish.

Inspect lilies for the scarlet lily beetle.

Protect lily, delphiniums, hostas and other susceptible plants from slugs and snails.

Prune out any remaining frost damage from affected evergreen shrubs.

Inspect box and holly trees for signs of blight.

Regularly mow lawns to keep them in shape. If you are experiencing prolonged dry weather, set your mower blades higher to reduce stress on the grass.

Clip evergreen hedges such as Privet, Box and Yew whilst they are in active growth.

Remove blanket and duckweed from ponds to allow the plants and fish room to breathe.

Keep birdbaths topped up in hot weather.

Plant out tender vegetables such as courgettes, squash, tomatoes and sweet corn now the risk of frost has passed.

Pinch out any side shoots from your tomato plants and feed once the first truss is setting fruit.

Continue to earth up potato plants as they grow.

Harvest salad crops and resow every 2 weeks for a constant supply of leaves.

Plant out young plants of runner beans, French beans, courgettes, pumpkins, squashes and sweetcorn, plus outdoor tomatoes and cucumbers. Also plant Brussels sprouts, cabbages, cauliflowers and celeriac.

Start harvesting herbs.

Heavy crops of fruit, especially if they are close together, can be thinned out to allow them to develop properly. Do this when the tree has naturally shed some of its fruit.

Apply grease bands to young fruit trees or paint grease strips on to larger trees to protect crops from damage caused by earwigs and ants.

In the greenhouse, use blinds or apply shade paint to prevent the over-heating in sunny weather.

Damp down your greenhouse on hot days to increase humidity and deter red spider mites.

Continue to harden off half-hardy bedding plants to acclimatise them to outdoor conditions.