Moisture and the presence of
clay are injurious, the plant being extremely sensitive to an excess of
water, and would in such case immediately perish. A southern exposure is
the most favorable. The best time for putting the seeds in the ground is
from March to April. It can be done even in the month of February if the
weather will permit it. After the soil has been prepared and the seeds
are sown they are covered by a stratum of ground mixed with some
vegetable mould, when the roller is slightly applied to it. Every five
or six days the watering is to be renewed, in order to facilitate the
germination. At the end of about thirty or forty days the young plants
make their appearance, and as soon as they have gained strength enough
they are transplanted at a distance of about six inches from each other.
Three months after this operation they are transplanted again at a
distance of from fourteen to twenty inches, according to their strength.
Each transplantation requires, of course, a new watering, which,
however, should only be moderately applied. The blossoming of the
pyrethrum commences the second year, toward the end of May, and
continues to the end of September." Mr. Willemot also states that the
plant is very little sensitive to cold, and needs no shelter, even
during severe winters.
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