I think it has something to do with the plants not getting enough water. You could also look into getting your soil tested for having too much sodium or sulphur, also your water, some plants like filtered water better, perhaps you could buy onr of those britta (sp?) pitcher water filters, so when you water with the garden hose fill up the pitcher and it filters for you.
Also certain types of cuc's are for pickeling and the breed is naturally more bitter. Try the next time you buy seeds on-line to ask the help people which are better salad ones.
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