It is not too late at the end of March/early April to sow tomatoes. If you do sow now, which is a little later in the season, it is best to pick the smaller varieties of tomatoes. Basically, the larger the tomato, the longer growing season it needs to come to fruit and ripen, so the small cherry types are good to sow now.

For best results fill up a seed tray or small pots with seed compost and press down gently to remove any air pockets. The reason for this is that if roots find themselves in air instead of soil, especially young delicate roots, the root may die which could be critical in the early stages. 

Place a few seeds per pot or in the tray and cover very lightly with compost, mist gently with water. Place in a warm sunny spot such as a heated greenhouse, conservatory or window sill. 

Seedlings can get leggy, especially if grown where the light is all from one side, such as on a window sill. The seedling is drawn to the light and becomes long and leggy, as in the image below. This can be remedied by repotting the seedling deeper into the soil which will give only a small study stem above ground. The images below what to do if your seedling is too leggy. The image on the left is the leggy seedling and then on the right re potted.

Once the seedlings are mature pot on and then check How to Grow Tomatoes which is packed with growing tips and advice to get a tasty crop. Or you can splash out on the Sunday Gardener's short book "Success with Tomatoes"  which is a comprehensive guide to growing tomatoes. 

Late February and early March is the best time for Pruning Clematis to ensure it produces lovely flowers year after year. Clematis prune can seem a bit complicated, but not really. Group 1 Clematis do not prune at all, and group 1 flower early in the year. Group 2 is a light prune, and Group 3 a hard prune. To check which you have there is detailed information on the Clematis pages to help identify the group to which a clematis belongs if you have no labels or information.  If all fails and you have no idea, Group 2 usually flower in mid summer and Group 3 later in summer which is not true of every type of clematis but it can be the best guess. 

All the books and magazines say "prune to an axial bud" so to know what to look for are two images below. At this time of year on some Clematis the axial bud will be easy to spot, as in the first image, on others is can be quite small and you need to look carefully. 

There are also videos to help you identify your clematis and to which group it below on the Sunday Gardener You Tube channel.

Do your strawberries look like this?

The image left shows strawberries before they have been cut back. Ideally, strawberries should be cut back in late summer, afterfruiting and once any runners have been removed or potted on to make new plants.

Not everything in gardening goes to plan and I didn't get round to cutting back the strawberries until February. It still has to be done, as you do not want to start the growing season with lots of dead leaves which will only lead to problems and an inducement to Botrytis, Grey Mold.

If you live in the south with lots of sun, or the east with low rain fall, Botrytis is less of a problem but anywhere tending on the wet side is higher risk and it is one disease strawberries are prone to.

Start the season with clean-cut plants which allows plenty of light and air circulation.  More tips on growing strawberries.