1. how long can sunflowers be left before picking in order to avoid their being killed by frost.
2. how senstive are basil and thyme – when to bring inside.
Sunflowers are hardy annuals that can tolerate some frost. Pick them before frost but they should be fine after a light frost. The basil should be brought in as soon as possible as it is not hardy and will be killed by frost. Thyme will be fine and return next year.