Welcome to my potting shed! This is the column where I’ll share all my gardening hints and tips – and I’ll try to answer any queries you may have.

Every year a good number of my tulip bulbs are eaten by squirrels. Is there a way to deter them? G McHarg, Uplawmoor

The only way to beat squirrels is with a physical barrier so instead of putting your bulbs directly into the ground, plant them into the tubs designed for water plants, which have lots of holes for the roots to grow through and sink these into the ground. For added protection, wrap a layer of chicken wire over the top of each container.

Continue to deadhead bedding plants and perennials to stimulate more flowers.

Four years ago I planted a purple Cotinus. It looks healthy enough but it is no bigger now than when I planted it. Why will it not grow? James Taggart, Yoker.

I suspect your plant was root-bound when it went into the ground. Dig it up and tease out the roots then replant it with lots of organic matter and it should improve.

Give lavender a light trim as the flowers fade. This will prevent plants from becoming woody.

What is the best way to get a good crop from artichokes? I want to grow them on my allotment. Harry Gordon, Glasgow.

In the first year nip out the flower buds to divert energy to the roots. Then, after harvesting in the third year, dig up and discard the plants, replacing them with offshoots.

Check courgettes daily and remove any that are ready to pick.

I’ve grown carrots for the first time this year, but the roots are stunted and forked. Is this caused by club root? Emma Chalmers, Beith.

The problem lies in the soil. Carrots become mis-shapen when grown in stony or very heavy soil. In future dig a deep trench, remove all stones and add sand until the soil is light and free-draining and your carrots should do better.

Treat plants in pots with parasitic nematodes this month to kill off vineweevils and their grubs.

The leaves of my Skimmia have turned yellow. Is it too late to save it? Clare Sweeney, Ellon.

This is a common problem with Skimmias and occurs when they are grown in soil that is slightly alkali. Mulch with ericaceous compost and feed with a solution for acid-loving plants and the leaves will turn green again.

Sow seeds of pak choi now for an autumn crop of oriental leaves.