Chlorine did my drive way. Nasty stuff but worked very well*
*not granite – concrete with small stones embedded.
Alternatively, go the other way and spray this onto the new wall for moss / lichen growth.
Mix the following together and bring to a boil stirring frequently:
1 pint milk
1 teaspoon flour
1 teaspoon yeast
1/2 teaspoon gelatin
1 tablespoon green algae powder (Spirulina or chlorella may be obtained from the vitamin department at some grocery stores. Pet stores may carry fish food that is mostly algae.)
1/16 teaspoon water soluble fertilizer with micronutrients (bloom boosting formula preferred, such as 15-30-15 or similar, NOT acid loving formula.)
Remove from heat as soon as boiling commences, and cool to room temperature. The formula may be stored a few days in the refrigerator.
Immediately prior to application, add:
2 teaspoons of lichen flakes collected from common lichens growing in a similar microenvironment to where the new lichens are wanted.
2 teaspoons of healthy soil collected from an area near where lichens are currently growing.
Shake or stir well.
Use a paintbrush to apply this solution to the areas where you would like new lichens to grow. Apply as soon as practical after making the formula since this is a living, very bioactive mixture. For best results do not apply during a rain storm, or when rain is expected within a day.
