Improving Pinguicula moctezumae Root Development with Lime-Amended Soil

A grower's P. moctezumae has minimal roots—rosette lifts off soil surface. Tried grittier peat-free mix without success. Grown in greenhouse with good light, no standing water, western Oregon.

Jeff Dallas prescribes: 2 parts sand, 1 part peat, 1 part perlite, mixed dry, then add 1 tablespoon powdered dolomite lime per cup of soil. Wet thoroughly and repot. Since adding lime to butterwort mix, nursery has seen dramatic health improvements. Use powdered (not prilled) lime. Light foliar fertilization also helps.

Mexican Pinguicula often grow in calcareous soils in nature. Dolomite lime (calcium magnesium carbonate) raises pH and supplies essential minerals. The gritty, lime-amended mix mimics natural conditions, promoting robust root systems.