Plant Science Terms - U

Umbel - type of flower cluster where pedicels arise from a common point and are about equal in length, like Queen Anne's Lace 

Understock - see Rootstock

Upright - plant that is taller than it is wide with mostly straight edges. These plants often have a somewhat spikey appearance

USDA zones - areas created by the USDA that indicate average-low winter temperatures and used as a plant hardiness indicator. Other plant hardiness zones developed by other entities use different numbering systems


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