As these are very seldom grown from seed, and are semi-biennials, art
has to be used to preserve or renew them. About the end of this month
take shoots of this year about three inches long, cutting them carefully
off, and smoothing the cut end with a sharp knife; from this cut the
lower leaves off about one inch and a half, and then put it in the
ground; choose a very shady spot, mixing the soil with a little sand and
earth of decayed leaves. Sprinkle them three times a day until they have
taken root, which will be in a few weeks. Keep the cuttings about four
inches apart.