notes from gardeningknowhow.com
CALCIUM FOLIAR SPRAY WITH EGGSHELLS
To make calcium spray for plants with eggshells, boil 20 eggs in a pan covered with 1 gallon of water. Bring to a rolling boil, then remove from heat and allow to cool for 24 hours. Strain the water of shell fragments and store in an airtight container in a cool, dark place.
Another way to make homemade calcium rich foliar spray is by filling a gallon jar with water and eggshells. Steep for one month, allowing the eggshells to dissolve and filter their essential nutrients into the liquid. To create your calcium foliar spray, mix 1 cup of the resulting solution with 1 quart of water and transfer to a spray bottle.
CALCIUM FOLIAR SPRAY WITH SEAWEED
Collect the seaweed (if legal to do so where you are) or buy at the garden store and rinse thoroughly. Chop up the seaweed and cover with 2 gallons of water in a bucket. Cover loosely, ferment for a few weeks, and then strain. Dilute 2/3 cup to one gallon of water to make a calcium foliar spray.
CALCIUM FOLIAR SPRAY WITH CHAMOMILE
Chamomile contains sources of calcium, potash and sulfur, and as such is good for preventing damping off and many other fungal issues. Pour 2 cups of boiling water over ¼ cup chamomile blossoms (or you can use chamomile tea). Let steep until cool, strain and place in spray bottle. This foliar solution will keep for one week.
CALCIUM FOLIAR SPRAY WITH EPSOM SALTS
Great for any number of things, Epsom salts contain magnesium and sulfur, and where there’s magnesium there is certainly a correlation to calcium. The magnesium content aids the plant in utilizing other nutrients, such as calcium, more effectively. Plants, such as roses, tomatoes and peppers, which require higher amounts of magnesium, benefit the most from this spray. The general recipe for using Epsom salt as a calcium foliar spray is 2 tbsp. salts to 1 gallon of water, but for the aforementioned, cut the Epsom salt to 1 tbsp to 1 gallon of water.