If so, I'm sure you noted when you first noticed each newly blooming flower. If so, last of all, you've been practicing phenology, the science concerned with periodic biological phenomena. Don't confuse it with phrenology , like I did. My search for good weblinks was rather bumpy until I figured out the difference and dropped that extra 'r'. Phenology starts with observation , noting events in an area.
Events are the arrival of migrating populations, emerging insects and sequence of bloom .
Phenology continues by noting the duration of these events and trying to connect seemingly disparate events in logical ways. Migrating birds, like redwing blackbirds , fly north following available food sources. Forsythia blooms are dependant on ground temperature-the same temperature that crabgrass finds most comfortable for germination. Pre-emergent herbicides, applied when the forsythia blooms, will stop crabgrass seeds in their tracks. If those same herbicides were simply applied sometime during early spring, they might lose potency before they had a chance to stop sprouting crabgrass seeds.