Pointers from the experts Most herbs are best harvested before they flower, however, some herbs will add interest to the garden by allowing them to bloom. Each season I evaluate the how much I need to harvest & let the rest flower. Acid loving plants like Azalea & Rhododendron will appreciate your tea bags. When you are done with your brew, turn the tea into the soil. To conserve water, only water in the early morning or evenings. Also, try keeping plants grouped together so that their shade will keep the pots from becoming overheated.