I have grown this bulb from seed and planted the bulbs out in the garden
when they were about 3 years old. They have remained there for about 8
years now, flowering well each season. I don't think there is any danger of
their being eaten by mice or other rodents -- I believe hyacinth bulbs are
unpalatable to these pests, since they are never bothered in my garden,
which is horribly infested with both field mice and voles. My plants have
survived temperatures as low as 5 degrees F (about minus 15 C). I also grow
a form called H. orientalis subsp. chionophyllus, which has lighter blue,
larger flowers; it is in the bulb frame at present.