Use only at night or morning to avoid the heat of the day. One, or possibly two, applications should be sufficient. However, as the plants are so robust, there is little chance of infestation. Croweas are really quite tough, enduring and completely frost tolerant. Crowea saligna and its cultivars are rewarding plants for a sheltered position in the garden.
All species prefer to grow in a moist, well-drained position, with some protection from winds.
However, plants of C.exalata have been growing in full sun without apparent problems. Some form of mulching to retain moisture is a great help. Amazingly enough Crowea species adapt to a wide range of soils. They will accept liquid fertilizer used sparingly, at monthly intervals. Croweas, if desired, can be grown as pot plants, using large pots.