It is propagated by offsets, which are often planted in September or October, but the principal crop should not be got in earlier than February or the beginning of March.
Attached to the rod by offsets are one or more plunger or bucket pumps, set at intervals in the shaft.
They are readily propagated by offsets or by seed.
The breeder bulbs and their offsets may grow on for years producing only self-coloured flowers, but after a time, which is varied and indefinite, some of the progeny "break," that is, produce flowers with the variegation which is so much prized.
Tulips are usually increased by offsets, which most varieties produce in fairly large numbers.