Well at last the snow is beginning to thaw a bit here. The long carrot house I built last year has suffered a bit of damage due to the amount of snow but nothing irrepairable. This led to this post on the issue of whether you grow carrots for show under cover or not. There are several schools of thought on this - I grow my stumps under cover in tunnels, however I grow the long carrots in a mixture of polythene and enviromesh covers, although this year I will also be growing 36 completely under cover(more about them in later posts). The stump carrots without a doubt perform better under cover. Why? - Well one of the reasons may be a better and constant temperature. Research on carrots has shown that the root length and glucose content decreased as temperature increased.The carotene content stays unchanged at temperatures between 10 and 21c,but decreased as the temperature rises from 21 to 27c. Most experts also agree that the best colour and the highest content of carotenoids are obtained at temperatures above 16c and below 21c.So thats one of the reasons I cover,in that I am trying to keep as constant between these two temperatures as possible(not always easy!!).