I have had good success in growing many things from cuttings, like hibiscus and frangipani (plumeria), by dipping the stem in honey and putting the cutting into sandy potting mix mixed 50/50. If the weather is cold to cool, a plastic bag over the pot gives a hothouse style of growing.
Hydrangeas grow easily from cuttings too. Make sure there is a least 3 eyes (leaf nodes). The bottom one should be placed in the soil (I use potting mix) and this is where the roots will grow from, Also cutting off any large leaves is important so all of the plants energy can go to making roots.
Source: This was information from my mother who was an avid gardener
By joycerose from Morley, WA
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Tips for starting plants from cuttings. Post your ideas.