All of the stalks of a plant may be harvested at one time, or pulled out selectively over a 4-6 week period. After the stalks are cut, the leaves may be removed. The time of harvest is dependent upon the variety as well as on the location and temperature. With varieties that produce many seed stalks, harvesting should begin before the seeds start to turn color. Generally, harvesting begins in late May or early June, with an option of a second harvest made in late August.
Clean culture is important since no herbicides are registered for use on rhubarb.
The fields should be cultivated in the spring and after cutting, and hand hoeing may also be necessary. Rhubarb is relatively free of insect and disease problems, although leafhoppers and rhubarb curculio may occasionally cause damage. Because the the curculio also feeds on curly dock, the elimination of this weed in and around rhubarb fields will help to deter infestation. This information is for educational purposes only. References to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned.