Philodendron, Lickety Split Gertens Garden Center Lavender season is here in NorCal! It's one of our favorite flowers to chase (and one of the few we're actually successful at). Each year, we cross a new farm off our Best Houseplants for Purifying Indoor Air Wellness Mama Transplanting mature lavender plants is simple! , Step 1. Make sure the weather is cool as this is when the plants begin to get dormant , Step 2. Tie the top of the plant for protection. , Step 3.