The Southern United States Species
P. caerulea P. ionantha P. lutea P. planifolia P. primuliflora P. pumila
These plants grow best in acid planting media. The acid media listed for the temperate Pinguicula species are suitable for these also.
While summer temperatures in their native habitats may reach and exceed 95°F (35°C), ground or soil temperatures are usually lower. Summer temperatures 70-90°F (21-32°C), winter temperatures 35-50°F (2-10°C). Some species are subjected to light frost in their native habitats.
Growth stops during the coldest part of the year but the plants remain green. They should be kept drier during the dormant season than during the period of active growth. Treatment with a fungicide will ward off decay. It has been reported that some of these Pinguicula species go dormant during the summer when there is a prolonged drought.
Water & Humidity
These plants enjoy high humidity and wet soils during the growing season, but the medium should be drier during the dormant period.
Indirect or shaded sunlight is generally suitable. Under artificial lighting use 900 foot candles. Photoperiod for the summer 14 hours, for the winter 10 hours.
Many growers have trouble keeping their subtropical and tropical Pinguicula spp. growing from season to season due to rotting. We have found that placing Vi in. (1.3 cm) of washed coarse sand or small pebbles on top of the planting medium in a pot eliminates plant rot or decay. The plants' roots must extend into the media below the pebble or sand layer. The sand or pebbles are positioned around the crown of the plant. This allows the crown area to remain relatively dry while the roots are in wet or damp soil.
Flowers must be pollinated by an external agent such as insects or artificially in order to set seed. Follow the procedure given for temperate species. Seed can be sown immediately and will germinate. We have found stratifying the seed for about 2 months results in a more uniform and a greater percentage of germination.
Leaf cuttings: Follow the same procedure as given for the temperate Pinguicula spp. except that the temperatures should be higher, 70-85°F (21-29°C). The more succulent the leaves the greater the success rate.
Species such as P. pumila, P. primuliflora, and P. planifolia will develop small plantlets on their leaves while growing under conditions of high humidity, usually in late summer or early fall. (Photo 5-7) These plantlets, if continually removed, can be used to start new plants.
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