Garden Diary: June
Bulbs and flowers
Plant out annual summer bedding plants now the risk of frost has passed.
Cut down spring bulb foliage as soon as the leaves start to yellow, lift and divide overcrowded clumps.
When sweet peas start to flower, keep picking them to encourage more flowers.
Dead-head and cut back oriental poppies after flowering. Cutting them close to ground level will stimulate fresh foliage.
When hardy geraniums have finished flowering cut them back to encourage new foliage and flowers.
Deadhead perennials as soon as the flowers fade.
Stake tall or floppy perennial plants against wind damage.
Keep an eye out for the bright red lily beetles – crush any you see and check for the sticky brown larvae on the underside of leaves.
Watch for white powdery mildew – cut back affected parts and spray with a fungicide to prevent further spread.
Look out for sickly plants. Check for vine weevil grubs by tipping plants out of their pots and looking for the creamy maggots. Wash roots and replace the compost.
Sow seeds of biennials, like foxgloves, wallflowers, stocks and Sweet William.
Greenhouse and containers
Move baskets and containers outside to their final position. Trim off long and leggy growths to keep them bushy. They will need weekly feeding from now on.
Pots and containers may need watering every day during hot spells.
Pinch out any side shoots from tomato plants and start feeding once the first truss is setting fruit.
Keep cucumbers, aubergines and peppers well watered and vent the greenhouse on hot days.
Increase shading if necessary and damp down the greenhouse floor in the mornings.
Look for whitefly and red spider mite and take prompt action if seen.
Feed houseplants weekly.
Trees, shrubs and climbers
Keep newly planted trees and shrubs well watered whilst they establish.
Dead-head roses and remove any suckers, especially from standard forms. Treat aphids and black spot promptly.
Deadhead azaleas and rhododendrons as soon as the seed heads are dry. Be careful not to damage or remove next year’s newly forming young buds.
Prune back flowered stems on early flowering shrubs.
Continue to tie in and train new shoots of climbing plants.
Pruning of plum or cherry trees can begin now.
Thin out fruit trees where branches are congested with too many fruitlets.
Net or hang old cd’s in fruit trees and bushes to reduce bird damage.
Keep soft fruit bushes well watered and net to protect from birds.
Continue to earth up potatoes.
Keep beans well watered.
Harvest salad crops and re-sow every 2 weeks for a constant supply.
Lawns and other jobs
Start lowering the blade on the mower.
Keep the hoe sharp and use it to remove annual weeds around plants in the borders on dry days.
Keep bird baths full of clean water. Hose out any algae regularly.
Make sure your feeders are replenished.
Keep the binoculars to hand and watch out for those baby birds.