Pinguicula leaf-pullings
Mexican Pinguicula leaf-pullings as a method of propagation, are a simple, easy, and wonderful way to vegetatively increase the number of plants in a collection. To provide an easy way to share the material necessary to get others started with a particular plant. And, as I've taken to doing, provide a backup reserve of little replacement plantlets, if something happened to the more mature plants of that type and I needed to replace them quickly.
Plantlets of most Mexican Pinguicula can be initiated on most any detached leaf. Summer leaves, winter leaves, most any time. They can be initiated by gently removing them from the stem. In most plants, by a gentle pulling and twisting motion. Some, such as P. reticulata are predisposed to have their leaves easily detach in this manner, so great care must be taken when handling this species, so that it does not drop all of its leaves from the stem. I place leaf-pullings, sorted by variety, and labeled, into individual ziploc plastic bags (with a piece of paper towel inside to absorb excess moisture, respirated by the leaf-pullings (otherwise they sometimes rot). Most often I simply drop the leaves into individual disposable transparent plastic cups, with nothing in them but the leaves and a label (if I don't write the name on the rim of the cup). I stack the cups where they can get some indirect light (but not so high they easily fall over) - and direct sun will cook them almost immediately. I clip the ziploc bags on the edges of light fixtures with wooden clothes pins.
Almost without exception many plantlets form and they will remain small, yet viable, sometimes for several years.
I've had P. reticulata form plantlets on the initial leaf-pullings, then on the leaves of the plantlets thus formed, and then on the leaves of those plantlets, before I finally planted them up. Quite an increase in total numbers, overall.
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Another alternative, with the transparent plastic cups -> once the leaf-pullings form plantlets, if there is enough space for the cups to fit where they can get a full amount of growing light, is to periodically add water and nutrients to the plantlets in the cups and they will continue growing towards maturity (as semi-aquatic/epiphytes), or until they run out of space (whence they can be potted-up).