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The Reader Digest did a book called The Gardening Year that has maps of how much later or earlier regions were than Wisley - thus for March, Cornwall is four weeks earlier and Angus two to three weeks later, so if you were thinking of planting early spuds in mid to late March (as one does in the sunny south-east), lucky Cornish gardeners would have done the job in mid to late February, people in Ayrshire (and Yorkshire) would have to wait one week after Wisley, while you unfortunates in Angus will have to delay planting for two to three weeks depending on how cold your region is. (Aberdeen is a four weeker, Montrose a two week wait). On the other hand pest and disease pressure is much less in the cooler north and quality of produce often benefits from the lack of stress.
It is much the same in April, but the differences in May are very marked, with the south warming up amazingly so that the most northern and eastern regions of Scotland are four to six weeks later than Wisley, and will not match average southern June temperatures even in late summer. This explains the difficulties experienced in growing heat-loving crops outdoors in the north.
The same applies at the back end of the year with Wisley September gardening tasks needing to be done a month earlier in Scotland, which pretty much rules out many of the July and August sown catch crops so valuable in the south. On the plus side you probably won't have to cut your lawn as often.
Of course weather is very variable and the conditions you actually encounter could be completely different in any particular year and you can expect a two day delay for every 100ft above sea level that your garden is.
Boggy
Beware the bat-eared bogweevil
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