Why do my roses still have black spot?

Jill Young, Stroud, Gloucestershire Professor Buczacki is ...

■ The Greenhouse Book by Tom Brown was published earlier this year and is full of advice on maintenance, plants to grow, pests and diseases and constructing your own greenhouse. (Dorling Kindersley, £

From slugs to staking, follow the expert advice to keep your plants thriving this season

Do you know the name of this pelargonium? ...

Keeping an eye on your plants can help you nip problems in the bud

Helping you get your best-ever fruit and veg