Use for all plants grown in containers, pots and planters both indoors and outdoors. Use at anytime of the year but for better results begin use in spring when plants are starting to actively grow, Also acts as a nutrient boosetr for unhealthy plants. The liquid feed provides a constant flow of nutrients for 3-4 weeks for plants in 12-15cm pots or containers (two or three bottles are applicable for larger pots or containers).