How many degrees of frost will spring bulbs take? I am planting muscari, narcissi, crocus and tulips into plastic pots. I am tying coarse green hanging basket felt around the outside of them (looks more attractive than the plastic). And then an inch layer of decorative bark on top. The reason is that I am short of ceramic pots this year. Will the bulbs in pots like this survive penetrating severe frosts, say down to minus seven? Or should I also wrap two layers of bubble wrap around each pot, and then the green felt around that? Advice would be much appreciated. (I planted a few tulips in a lawn last year, only a finger deep, and even they came through).
- 18 Nov, 2010