Utricularia longifolia Browning Leaves: Causes and Solutions

U. longifolia doesn't have a dry winter dormancy. Browning leaves usually indicate:

Common Causes

1. Age: Leaves naturally last ~6 months.
2. Soil degradation: Old mix breaks down, becomes anaerobic.

Remedy

Repot in fresh 1:1 dried sphagnum:perlite (or 1:1 peat:perlite) in a larger pot. Moisten mix before use. This refreshes the root zone and stimulates new growth.