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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