Q: I have a Catalpa tree 18ft high near a garden wall.  I am getting worried about the roots of it … both for the wall and a
neighbours extension.  Does it have to go? Thanks, Bryan.

A: Catalpa is a very large tree and I would honestly say that it is better in a park than in a garden.  It would be wise to speak to an Aboreaculturalist for specific advice, however, you must check that they are insured to give you such advice.

Q: I have 5 big pots in which I’ve got lilies growing, on some now the flowers are starting to fall so coming to an end. Can you please tell me what I do now keeping them for next year … once the flowers have fallen do I cut the stems down or leave them?  Thank you, Dorothy.

A: The stems are normally left until they start to die back and go brown, then you can cut them back.  Up until that stage it is import to keep the soil moist and maybe in early stages a liquid feed across the stem and leaves will help the lily bulb for future years.  Then stand somewhere shaded and water occasionally.