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No Mere Coincidence
Fastened to our refrigerator door with a cow-shaped magnet is a fading
piece of print clipped from some newspaper or almanac long ago. The
clipping has outlived at least three refrigerators and survived several
moves, traveling with us like some heirloom we dare not misplace.
Though curled at the edges and smeared a bit, the words are still legible:
- When the first leaves of the lilac appear… plant peas, potatoes, lettuce, radishes and the like.
- When the first lilac blossoms appear… plant beets, carrots, kohlrabi and other cole crops.
- When lilac blossoms reach full bloom… plant beans, corn, cucumbers and squashes.
- When the lilac blossoms fade and fall… the danger of
frost is probably past and it’s time to set out tomatoes, peppers
and other warm-weather crops.
These tips, which have served as our planting calendar for many
years, come from phenology, the study of biological phenomena and their
happy coincidences. Farmers and gardeners have been noticing and
recording phenological relationships as folklore for ages, like the
date that migrating birds return, the first flower dates for plants,
and the date on which a lake freezes in the autumn or opens in the
spring. Phenological records can provide valuable insights about the
natural world. If recorded carefully and consistently, they can have
scientific value for understanding the interactions between organisms
and their environment and for assessing the impacts of climate change.
I keep a file marked “Phenology” in which I collect
aphorisms the way some folks collect stamps. Some are pieces of poetry
or proverbs. Others are more like rules of thumb. Here’s a few
examples:
- When oak leaves are the size of a mouse’s ear… set out tomato, eggplant and pepper plants
- When new oak leaves are the size of a squirrel’s ear… look for morels.
- When forsythia blooms, prune roses
- A wet, cold May? A barn full of hay.
- If owls screech in foul weather, it will turn to fair.
- Fish spawn when dogwood is in bloom.
- Catch your fish when rain is in sight.
- Rains are very near when toadstools suddenly appear.
- The danger of frost is past when white clover blooms.
- A swarm of bees in May is worth a load of hay.
These may seem like superstitions, but there’s a lot of
scientifically verifiable information backing up our folklore.
Phenology is one of the cornerstones of Integrated Pest Management, for
example, which employs “plant phenology indicators” in
timing applications of various agents to control insects and disease.
In the field, it’s much easier to notice that the forsythia is
blooming than it is to calculate “growing degree days.”
In my own garden, it might be more scientific to use a soil thermometer
and meteorological forecasts before setting out tomatoes, but lilac
blossoms are more elegant.
_______ by Michael Hofferber
Copyright © 2008 Outrider. All rights reserved.
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