In horticulture, Yeast Activity describes microbial activity by yeasts.. . Yeast Activity is most useful when it is tied to the exact plant part, season, cultivar, and growing conditions being described.

Young Wood refers to recent shoot growth that has not fully matured. For pruning, grafting, and variety notes, Young Wood should be recorded with its position on the shoot so the observation can be connected to buds, fruiting sites, dieback, or new growth.

For Young Wood, record where it occurs on the shoot or trunk; that position can affect pruning decisions, regrowth after winter injury, grafting, and fruiting wood.

Zinc Deficiency means a shortage of zinc that can affect growth and leaves in practical plant language.. . Zinc Deficiency is most useful when it is tied to the exact plant part, season, cultivar, and growing conditions being described.