Matthew Biggs, Christine Walkden and local gardener Alison Pringle answer horticultural questions at Scampston Gardens.

Pippa Greenwood gives the lowdown on using nematodes as biological controls, and Alison Pringle explains how to create an American Prairie garden.

Questions answered in the programme:
I layer used tea-bags banana skins, paper and gravel at the base of my pots and baskets. Will this benefit them at all?

My Katsura trees are too tall to fleece. How can protect them from frost?

Why do my primulas always wither and die?

My 3ft topiary box spirals are totally potbound. How do I pot them on? When do I prune them?

Should I spray my rusty garlic leaves?

How do I establish my water lilies in my pond which has part shade, part sun?

Can I clip my beech hedge now?

Do woodlice damage plant roots?

My lavender hedge has not been pruned for a long time. It's woody with little green growth. How can I revitalize it?

I use my great grandfather's tools. Do you have a sentimental attachment to tools or plants?

Produced by Howard Shannon
A Somethin' Else production for BBC Radio 4. Show less