Over watering plants ties up oxygen.
image by xandert: morguefile
Over watering plants causes the soil to be saturated, with water filling spaces that are normally filled with air; the roots are subsequently unable to take in oxygen, and the plant suffocates.
About this Author
Nannette Richford is an avid gardener, teacher and nature enthusiast with more than four years' experience in online writing. Richford holds a Bachelor of Science in secondary education from the University of Maine Orono and certifications in teaching 7-12 English, K-8 General Elementary and Birth to age 5.