June Gardening Tips
June 21 is the longest day of the year, and the extra light and warmth encourages the garden to put on an exuberant burst of growth. But this extra light and warmth also means weeds will sprout up from seemingly nowhere. Keep on top of them by hoeing regularly in dry conditions.
Top 10 jobs this month
Hoe borders regularly to keep down weeds
Be water-wise, especially in drought-affected areas
Pinch out sideshoots on tomatoes
Harvest lettuce, radish, other salads and early potatoes
Position summer hanging baskets and containers outside
Mow lawns at least once a week
Plant out summer bedding
Stake tall or floppy plants
Prune many spring-flowering shrubs
Shade greenhouses to keep them cool and prevent scorch
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Regularly mow lawns to keep them in shape - removing 'little and often' is the key to a good quality sward. Continue cutting lawn edges with a half-moon edging iron to ensure they are neat.
Mow pathways through areas of long grass to allow access to other areas of the garden (left).
Add grass clippings to the compost heap in thin layers (too much grass all at once is likely to be very wet and poorly aerated, resulting in smelly slime rather than compost).
Apply a high nitrogen summer lawn fertiliser if not done last month to encourage a healthy-looking lawn - always follow the manufacturer's instructions carefully, as any over-use or runoff can cause water pollution.
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Move garden furniture and other objects regularly to allow grass to recover and prevent yellow patches.
Ensure new lawns (either from turf or seed) do not dry out during hot weather, as turves will shrink if allowed to dry out, and fail to knit together.
During periods of prolonged dry weather, you could help by keeping your lawn a little longer than usual, and even investing in a mulching mower. Mulching mowers shred the grass clippings very finely and then blow them into the lower layers of the turf, where they act like mulch to help the lawn retain moisture. Because the clippings are fine, the end result is not unsightly, especially later in the season when the lawn gets very dry, and the mulch helps to keep it green rather than brown.
If moss is a problem, choose a combined fertiliser and mosskiller when feeding the lawn; always follow the manufacturer's instructions carefully, as any over-use or runoff can cause water pollution. Many gardeners choose to tolerate at least some moss in their lawn, as they find it helps to keep it looking green when conditions are less than ideal.
Selective weedkillers are available for lawns, which will kill the weeds but not the grass or any naturalised bulbs (providing they've died down). However, they will kill wild flowers.
Disperse dry worm casts with a hard-bristled broom.
Molehills can be a problem in rural areas. Traps are the most effective way to deal with this problem.
Trees & shrubs
Pruning and training
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Cut back tender shrubs such as Penstemon, Caryopteris and hardy fuchsias after danger of frosts has passed.
Prune deciduous magnolias once the plant is in full leaf. If this is done in winter, when the tree is dormant, dieback can occur, and pruning in late winter or spring can result in bleeding. Midsummer is therefore recommended.
Clip evergreen hedges such as privet (Ligustrum), box (Buxus - left) and Lonicera nitida if needed. If they are not too woody, shredded clippings can be added to the compost heap.
Thin out new shoots on trees and shrubs that were pruned in winter to stimulate growth. Remove crossing stems and prevent overcrowding of new growth.
Prune out any remaining frost damage from affected evergreen shrubs.
Prune flowering shrubs such as Deutzia, Kolkwitzia,Weigela and Philadelphus after they have finished flowering. If this job is left too late, the new growth put on after pruning may not have sufficient ripening time to flower well next year.
Evergreens such as Viburnum tinus can also still be trimmed this month.
Rhododendrons can be lightly pruned after flowering. More severe pruning should wait until the following early spring.
Prune overcrowded, dead or diseased stems of Clematis montana once it has finished flowering. Untangling the stems can be fiddly, but once you can see where you are cutting, you need not worry about pruning this plant - it will take even hard cutting back very well.
Young mimosa trees (Acacia dealbata) can be cut back once all risk of frost has passed. Mature trees respond less well to hard pruning.
Prune wall-trained pyracanthas, removing any shoots coming out from the wall, and shortening other new growth to about 8cm (3in). This encourages spur formation, and increased flowering relative to green growth.
Remove any reverted green shoots on hardy variegated evergreens (such as Elaeagnus, left), to prevent reversion taking over.
Twining climbers (such as honeysuckle and Clematis) need regular tying in and twining around their supports.
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 stem. Therefore more flowers will be produced.
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Planting and moving
In wet areas, you can still plant containerised trees and shrubs. But if summer rainfall is scarce, then planting is best avoided. You would be wiser to wait until autumn, when the weather will work with you rather than against you to ensure the successful establishment of your new trees and shrubs.
Take softwood cuttings of deciduous shrubs, includingCaryopteris, Forsythia, Kolkwitzia, lavender and rosemary if not done last month.
Take softwood cuttings of many deciduous shrubs, including Fuchsia (left), Hydrangea macrophylla,Philadelphus and Spiraea.
Layering is a good way to propagate climbers and lax-stemmed shrubs. Layers should root by next spring, especially if attention to watering is given during dry weather. Examples to try include Philadelphus, Wisteria,Akebia and Lonicera.
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Hybrid tea roses can be disbudded, removing all smaller buds from the cluster that forms at the shoot tip, leaving the largest central (or ‘king’) bud to develop into a large, show-stopping bloom.
Ensure newly planted trees and shrubs do not dry out. Water with rain, grey or recycled water wherever possible.
Loosen any tree ties that are digging into the bark, or could do so soon as the trunk girth expands.
Sprinkle fertiliser around perennials, shrubs and roses.
Water around the crown of tree ferns, especially newly planted ones.
Dig out tree and shrub suckers. If sucker removal is difficult, sever the root to isolate the sucker from the parent tree and then carefully treat the sucker with glyphosate (as found in products such as Roundup Tree Stump and Rootkiller).