This year April (2016) has ended with a flourish of winter weather, snow, frost, wind, rain and cold after gardeners have been waiting for the soil to dry out following the winter floods in northern regions. Of course there were a few days of real spring before this just to fool all gardeners and allotment holders.
So of course this soil is not suitable for planting out more tender crops which means that we shall all be somewhat behind this year. This may well mean that your greenhouse, cold frame and home window sills are still full of seedlings which are being nurtured prior to hardening off and planting out or putting into a cool greenhouse.
As the National Allotment Society says of May, it can be a month when summer comes and you need to take care to protect your seedlings from sun and drought or it can be “a complete disaster bringing damaging frosts, cold winds with heavy rain or hail” which means that you need to use other forms of protection. But the advice that they give for a traditional May should be a guide to what we should be doing on the allotment.
A much more detailed account of what can be done on the allotment can be found here – again there is the advice to be careful with the weather as some crops are ones where you only grow a few (courgettes, marrows, pumpkins). There is also advice for the greenhouse here. There are quoted here a couple of proverbs – Welsh and English – which really do apply for this year.