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The Lilac Law

Lilacs bloom according to this algorithm:

1) Sum the squared mean daily temperatures (in Celsius) since the last frost.

2) Use an average of the past few years’ daily temperatures to predict the date when this sum will reach 4264.

Despite my distaste in math, I find this fascinating—not just that this law was figured out in the 19th century, but that it was figured out at all. But then phenology goes back centuries.

Phenology* is the study of natural cycles—how one influences the other, and how we can take cues from what happens. The first beech leaves that unfurl, the first flight of the swallowtail butterfly—every genesis reflects the fragile interconnectedness of soil, air, sunlight, temperature, and dozens of other natural factors.

Long before spreadsheets and calculators, growers created their own data by carefully watching and waiting for nature’s cues to sow their precious seeds. It was a question of survival, a much more in-your-face reality back then. With no Shop-Rite, and your nearest neighbor often miles away, carelessness meant rolling the dice on starvation.

Some of their data include:

When lilacs are in leaf, sow beets, cabbage and broccoli.

When lilacs are in full bloom, sow beans and squash.

When apple blossom petals fall, sow corn.

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Apple blossom.

Or, as Laura Ingalls Wilder writes in Farmer Boy (a biography about her husband Almanzo’s growing-up years on an New York farm in the mid-1800s), when the leaves on the ash tree are as big as a squirrel’s ears, sow corn.**

In the same book, little Almanzo eagerly awaits ‘the dark of the moon’ (new moon) in May so he can sow pumpkins.

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Another one. When you see these…

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(Bearded irises)

…set out transplants of these.

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(Melons. Clearly.)

I read that even Martha Stewart traditionally plants peas on March 17, St. Patrick’s Day.

Laura Ingalls Wilder’s father swore by ‘Plant turnips on the 25th of July, wet or dry.’

(Compelling story: He also went goose hunting one fall day in the 1880s while he and the family were living in Dakota Territory, and, utterly dumbfounded, returned home with nothing. It wasn’t because he was a lousy shot; it was because the birds were flying high above the clouds—he could hear them—but not one came down low enough to shoot. They were getting out of Dodge, and at breakneck speed. In fact, he said the entire prairie was still; every living thing was hidden away. Another day that same fall he said he’d never seen muskrats’ dens built so thickly. He got his family out of their rickety little claim shanty and into a sturdy house in town in a heartbeat. Can you finish this story—have you read The Long Winter? Blizzards slammed the mid west for virtually seven months.)

Do you sow, or act, according to any of these ancient rules? What successes or failures have you had?

Do you swear by any other cues?

Has the fairly recent wacky weather (here in NJ we had snow Halloween 2011, and snowdrops came up right after Christmas that year) affected what you’ve done?

Does anyone work with Project BudBurst, the environmental group that asks people from all over to record when plants start sprouting in the spring?

*Not to be mistaken with ‘phrenology’, a study based on determining one’s character by analyzing the bumps on one’s head. (I’ve had two concussions. For me, the smart money’s on ‘a touch clumsy’.)

**About 1/2″ in diameter. Don’t go chasing us to compare. –A PSA from the Squirrels Are Faster Than You Commission

wrongplanet.net/postt63638.html

budburst.org/

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