The Croton Petra indoor houseplants also known as Josephs coat is one of the more colourful indoor tropical plants. The Croton Petra is hard not to notice with its bushy upright stance and vividly coloured foliage. The Croton houseplant has leaves splashed with green; orange and red with the veins often yellow, depending on the variety. The Croton Petra should be kept in warm temperatures and kept out of draughts. Water moderately through the winter and allow to dry out between watering.