This is another poem in my sugar maple cycle, and I owe pretty much all of this poem to Margaret Skinner and Bruce L. Parker’s Field Guide for Monitoring Sugar Maple Bud Development. I highly recommend checking out the link, to see the great pictures and descriptions of the leaf and flower buds as they develop from dormancy to ‘Budbreak’. It’s one of my favorite sugar maple resources.
When I first began working on this poetry series and thinking about trees more deeply, I came to the conclusion that trees wouldn’t obey our seasons. So I hypothesized what I thought would be important ‘seasons’ for trees: Sunleaves, Deepnight, Sapriver, Budbreak, and Windborne. In human terms, Sunleaves is fall, Deepnight is winter, and Sapriver – Windborne take up early spring through mid fall.
Dormant buds begin as small conical shells of overlapping scales (that are actually highly modified leaves) surrounding either leaf or flower material. They survive winter by remaining inactive (we discuss this in brief in the ‘Sapriver’ biopoetics). As they leave dormancy into their initial swell, they grow larger but retain their conical shape. Trees exit dormancy when two conditions are reached:
- The minimum number of cold days has passed (hence why global warming creates serious concerns)
- Warming begins in conjunction with the longer photoperiods of spring
Basically, the longer days of spring can cause the buildup of gibberellin and this is part of the pathway for breaking bud dormancy.
After the bud swells, it continues to elongate and turn green (for leaves, yellow for flowers) and the scales surrounding the bud loosen, preparing for the emergence of what’s inside. In fact, they loosen enough to allow in parasites like thrips, which I wrote about in another poem (Comma after Late Budbreak, Defoliation by an Invasive Pear). Finally, the bud bursts into a group of flowers (called an inflorescence), or a wet-looking set of leaves (reminiscent of the ‘wet’ wings of butterflies right after they emerge from their cocoons). The wrinkled leaves are curled over the bud before they begin to unfold and spread wide, ready to photosynthesize. The flower bundles droop down, covered in pollen, before eventually shriveling up as seeds begin to form in their stead.