Sunburn on Venus Flytraps: Acclimating to Full Sun After Low Light

Answer

From the photo it seems that the plant has been in low light and was then suddenly placed in full sun. The small number of leaves indicating low light growing conditions for a period of time while the slight deformity on each petiole, along with the red blotches in uniform areas on each petiole indicate that the new young leaves were exposed to sudden, bright light as they developed and were burned by ultraviolet radiation that they were not yet prepered for. This is born out by the open traps with little redness within. Keep the plants in intense light for best results. If you have them in indirect or partial light now I would suggest placing them in more direct light for a week or two at a time progressively until the plants are back in full sun. In other words, if they are inside in an east window now, you would want to place them in a south window for a week or two, then out on a bright patio with partial sunlight for a week or two, then out in full sun eventually. Once in intense enough light they should develop redness in the traps (if they are not of a fully green subspecies) and not experience burning on the petioles or deformity from ultraviolet radiation if they have enough time to build up a sun tan so to speak.

Christopher