Onions will bolt due to cold temperatures. They are biennials and bloom in their second year so if they have some warm weather and then some cold weather before it gets warm again, they think that the cold weather was a short winter and they are in their second year and they will flower (bolt).
I don't know if this would also affect mustard or radishes but I usually grow radishes in early spring when it is still fairly cold and they don't bolt for me until it gets hot.
My spinach and bok choy which were both planted in the early spring are just starting to bolt now. I did have one variety of bok choy that bolted early before it even got large enough to eat. Don't know why.
|