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Some Passiflora species, e.g. fresh wet tropical species may have no inhibitors at all. I don't think anyone knows. We will assume they are there however for the purposes of this article, especially in tropical species that have dried out. Some dried out tropical species e.g. P. kermesina are certainly very very difficult to germinate. The inhibitors stop the seed from germinating too soon, e.g. while still inside the fruit, inside an animal's digestive system, over winter or while it is too dry or cold. The most common inhibitor in temperate plants is abscisic acid, a plant hormone, which induces dormancy in the embryo. There may also be other inhibitors. The plant 'judges' it so that seed from fruit ripening in Autumn takes all Winter for the enzymes in the seeds to degrade the abscisic acid. By spring or later, the abscisic acid is gone and the seed can sprout. I have seen this with Passiflora 'Adularia' seed. The fruit fell to the ground in late September (Autumn) & the tiny seed came up from the flower bed en masse the following August. It is difficult to believe that anything other than inhibitors could have kept such tiny seed dormant so long.
Moon phases.
Traditionally, gardeners have been advised to sow seeds at the full moon, perhaps because our ancestors discovered that seeds germinated more rapidly then. Some people today sow at the new moon in order to ensure germination before the growth spurt given the plant by the full moon. Probably not relevant to planting indoors in artificial conditions. If you are sowing seed outdoors, or planting, Moon phases may be important but there is no firm scientific evidence as to which & when, different sources of information being contradictory. Worth trying.
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