Timely Garden Tips For May
You can still divide herbaceous perennials now to improve their vigor and create new plants.
Tie up the foliage of spring-flowering bulbs. Do not cut off the foliage until they turn brown.
Prune out overcrowded and dead stems of early-flowering clematis after flowering.
Tie in climbing and rambling roses. Laying the stems horizontally will help to produce more flowers.
Prune spring-flowering shrubs after flowering.
Trim lavender plants now, cutting off any old flower heads and about 1 inch of the current year’s growth.
Feed and water container plants.
Top-dress permanent pot plants to refresh the compost.
Give your container plants a balanced liquid feed every two to four weeks to promote healthy growth.
Start to closely inspect your plants for pests and diseases – early prevention is easier than curing an infestation.
Look out for signs of blackspot on roses. If discovered, Blackspot can be treated with a systemic fungicide.
Continue to weed beds and borders to prevent competition for water and nutrients.
Continue earthing-up potatoes.
Harvest asparagus spears when they are no more than 7” tall.
Harvest rhubarb, picking only a third of the total amount of stems.
Thin out direct-sown vegetables such as spinach, carrot and lettuce seedlings then water the rows well.
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