Do the Winter temperatures get very cold?If so,there could be a danger of the roots freezing.Are these Rabbiteyes?If they were Northern Highbush,there is less need for concern.40F is about right for the needed chill.The planters could also be buried in the ground,til it warms in Spring.

The plants will only produce as per how many flowers were pollinated.Rain is good for them.I fertilize mine about every 3-4 weeks from April through July. Brady