GARDEN GURU
Q Should I cut back my daffodils once they have finished flowering?
Alice Richmond
A No. Pinch off flower heads when they start to fade, but allow leaves to die back naturally as they help to recharge bulbs for flowering again next spring.
Q A bright green weed that forms star-shaped rosettes has been invading my lawn.
Can you tell me what it is?
Colin Demmery
A The pesky weed is pearlwort (Sagina procumbens), which spreads underground by self-seeding. Hand-weeding is the best way to control pearlwort, since the leaves are resistant to herbicides. As it thrives in damp soil, you should avoid using a garden sprinkler in summer and make sure that the ground underneath is not compacted.
Q I have six water butts that are covered in duckweed. Is it OK to use the water on plants, or do you think I should get rid of it? Hilary Russell
A Duckweed acts a bit like a water purifier and removes harmful nitrates, so the water should be safe for use on plants. To stop duckweed growing, just place lids or covers on the butts.