You will notice clusters of small round spores on your grass. They may be white, brown, orange or black. Just sweep them off with a broom. The fungus itself lives in the soil, not on the grass plants. Be sure to apply snail bait when you put in bedding plants.
Snails can devour entire plants overnight.
Ants are active now. Check your plants to see if ants are crawling up and down the stems. Spray if they are. Ants will protect aphids and scale and other insects that produce honeydew. So many plants bloom in March, it is not possible to list all of them.