Zoreah

From Halachipedia
  1. Planting of any amount is forbidden. The applications of this prohibition are planting, grafting, removal of obstacles to the plant, fertilizing, watering, spraying insecticide, putting seeds in water, and moving a plant in a bored pot. [1]
  2. Washing one’s hands over plants on Shabbat is forbidden because watering a plant helps it grow and is forbidden on Shabbat. [2]

References

  1. Rambam Shabbat 8:2, Eglei Tal Zoreya 1,4-8
  2. S”A 336:3