Propagation: The crests are frequently grafted onto a
geometrizans trunk, but are easily grown on their own
roots. Any normal shoots should be removed to promote the growth of the
crest. It can be increased by cuttings, which will take root in a
minimum temperature of 20° C. Cuttings of healthy shoots can be taken in
the spring and summer, Cut the stem with a sharp, sterile knife, leave
the cutting in a warm, dry place for a week or weeks (depending on how
thick the cutting is) until a callus forms over the wound. Once the
callus forms, the cutting may be inserted in a container filled with
firmed cactus potting mix topped with a surface layer of coarse grit.
They should be placed in the coarse grit only; this prevents the cut end
from becoming too wet and allows the roots to penetrate the rich compost
underneath. The cuttings should root in 2 to 6 weeks.
Cultivation: This species presents no problems in cultivation
and will do well in a sunny spot in a cactus house. These plants will
tolerate sun and heat, but not extended periods of frost.
The crested form is more frost sensitive and should not be
kept at less than -0°C . Grow them in rich,
porous, sandy soil, and let their soil dry out
between waterings. If potted, repot in the spring, if
their roots become cramped. Generally, they should be repotted every
other year in order to provide fresh soil. However, this doesn't
necessarily mean they'll need larger containers. Fill about a quarter of
the pot with broken crocks, gravel, etc. to promote good drainage. After
repotting, do not water for a week or more. The crested plants enjoy a
warm sunny environment and for more speedy growth a light position on a
higher shelf with light feeding and rainwater given to the bottom of the
plant will ensure success, especially with rooted detached branches,
which do well in these conditions.