Use 5 ml of extract per gallon of water when watering. Product should last 24 uses if watering with 1 gallon of water. This extract is a customer favorite, baby spinach is rich in magnesium and vitamin k. In humans that improves bone density and growth. In plants vitamin k plays a main role in photosynthesis. Magnesium plays a main part in the plants chlorophyll production. A plant that is magnesium deficient may produce yellowing of leaves followed by stunted growth. Adding this extract to your routinely watering regiment will not only benefit your plants but also give you a reason not to stress if your plant is magnesium deficient.