Q Any tips for growing wildflowers on a patch of Thames alluvial soil?
ANigel Suffield-Jones, Berkshire
MATT SAYS Thames alluvial soil is chalky, alkaline clay, and suppliers offer specific seed mixes for this type of ground. Still, there may only be a short period when it’s workable in spring.
Prepare the ground by removing all debris, stones and the roots of perennial weeds, fork lightly to relieve compaction, then rake to a fine tilth. Give the bag a good shake, to mix the different seeds together. Divide the plot into metre squares with canes and string, then sow at the recommended density – half in one direction and half at 90 degrees, to ensure even distribution. Use a seed spreader or, if sowing by hand, mix the seeds with sand so you can see where you’ve sown. Then water in and keep the plot weed free.