How to water your Croton Petra. Water about once a week and let it dry out entirely between waterings. The Croton Petra loves humidity so either mist weekly or place in a well-lit bathroom with plenty of moisture. Avoid prolonged periods of drought.
Two good target ratios for croton fertilizer are 3-1-2 and 8-2-10. The first has more nitrogen, while the second has more potassium. As a result, you may find yourself switching between two different fertilizers depending on your croton's soil quality.
The Croton 'Petra' plant will produce multicolored leaves in moderate to bright, indirect sunlight. It can tolerate lower light, but its leaves will stay green like its new growth. It needs 4-6 hours of indirect sunlight a day to keep it colorful and vibrant.
Crotons love warmer vibes similar to its natural environment, so it prefers temperatures between 15°C-27°C/ 60°F-80°F. Keep this houseplant away from cold air or drafts in the winter, around your air conditioning units, and around windows that may leak cold air.
Repot a young croton every year in the spring or early summer for the first three growing seasons. After that, only repot when you notice roots growing out of the drainage holes or see roots growing at the soil level. Get a container with ample drainage holes.