Potting medium

Cuttings | Pots | Seeds | Soil
Perlite I think most hoyagrowers have their own favorite soil and potting mix. I have heard of collectors who grow their hoyas successfully in what ever regular soil they find in the open market. Others wouldn't dream of exposing their precious hoyas to such conditions.

Expanded clay When buying a hoya at the flower shop on the corner, the clerk will most likely tell you to give your plant lots of sun, little or no fertilizer and very little water. The myth that hoya is a water and nutrient defying plant ends at my front door... In fact, most hoyas prefer even moist to wilting. If you plant Hoya bella in a self watering pot and fertilize it regularly it will probably flower like never before, or let your Hoya serpens dry out and it will most likely die. My rule is, thick leaves needs lots of water but should be let to dry out, thin leaves needs water regularly. No hoya I know of like to have wet feet, so one needs a potting mix that allows air into it...

Mix 1 part perlite or vermiculite (observe that the latter is biodegradable and will decompose rather quickly), 1 part expanded clay of the smallest size and 1 part sphagnum moss or peat and 2 parts regular planting soil (peat can be used if sphagnum is the previous choice). This mixture is good for most hoyas. More sensitive species who doesn't like to dry out, more sphagnum moss could be added. I prefer to use regular soil with a minimum of 85% sphagnum, preferably more, or pure and fine sphagnum. Avoid planting soil with sand base as it quickly becomes dry and hard.

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