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- Propagation Methods
Hoyas may be propagated by seed, or stem or leaf cuttings. The seed
pods can take months to ripen. Once they have ripened, the seed pods split
and the seeds are dispersed by the air. To prevent this if you wish to
collect seeds, cover the seed pod with gauze or old nylon stocking material.
Seeds may be started in pots or flats. The seedlings seem to grow faster
in large batches. Use a good quality soiless potting mix enriched with
30% perlite or pumice and water only from below. Cover the newly planted
seeds with a thin layer of dry potting mix. Once the seedlings start to
develop true leaves, repot and plant out separately.
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- Propagation from stem cuttings is relatively easy. Use a cutting with
2 to 3 leaf nodes. Remove the leaves from the lower node, dust the end
with rooting hormone powder and bury in a good soiless mixture with 30-40%
added perlite or pumice. Water to thoroughly wet the soil and then allow
to drain. Do not allow the soil to dry out or stand with excess water in
a saucer. If you live in a very dry region, an occasional misting to raise
humidity will help.
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Leaf cuttings can be more problematic. The leaf should be placed in the
soil at a 45° angle, with the stem buried to the base of the leaf. Rooting
hormone seems to enhance rooting. Often leaves develop roots but do not
go on to produce healthy plants. 
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- References for Propagation Methods: http://www.international-hoya.org/prop.html
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