Fertilization Fertilizer solutions are usually injected
into the irrigation system (fertigation) in commercial
nurseries. Fertilizer may be supplied solely in controlled-
release forms (Osmocote, Phycote, Nutricote,
Polyon, etc.), or used in combination with fertigation
(see page xx). After the container stock leaves the wholesale
nursery, the retailer should maintain the stock with
adequate irrigation until the plants have been purchased
by the consumer. Controlled-release fertilizers
added to containers leave a residual fertilizer supply
(most retailers do not add supplementary fertilizer),
and help maintain the plants until they are purchased
by the consumer and planted in the landscape.