Rhubarb

[Cody Wellard]

Is there a good time to fertilize rhubarb?
Cheers
Cody Wellard

[Dumbo]

Iowa State Uni (Horticulture Science) states the following:

Fertilization
Rhubarb requires annual fertilizer applications for good
growth and large yields. Apply fertilizer in early spring
before growth starts.

Broadcast 1⁄2 cup of an all-purpose garden fertilizer, such
as 10-10-10, around each plant and work it lightly into
the soil. Avoid getting fertilizer directly on the crown. In
most garden soils, only nitrogen is needed after using a
complete fertilizer for 4 to 5 years.

Manure can be used as the main source of fertilizer by
applying a 2- to 3-inch layer of rotted manure around the
plants after growth starts in the spring. In addition to the
nutrients it contains, manure also adds valuable organic
matter to the soil. Manure should be supplemented with
1⁄4 pound of superphosphate (0-20-0) fertilizer per plant.

Ref: http://www.extension.iastate.edu/publications/PM719.pdf

Ark Uni, Horticulture Department, states to use a general all purpose fertilizer at the beginning of spring.

Ref: http://www.uaex.edu/Other_Areas/publica ... A-6076.pdf