Phenology: Nature's Signs for Spring Planting Times

Robin Sweetser

For centuries, farmers took planting cues from nature—bird migration, insect/amphibian emergence (like peepers), and native plant flowering.

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Nature's Signs: Phenology

Watching nature's signs is "phenology" (Greek for "science of appearances").

Trees, shrubs, and flowers are sensitive to temperature and day length, developing on a regular schedule based on local conditions.

Using them as planting indicators makes sense. Decades of observations yield reliable conclusions.

Following Nature's Lead

Nature's "signs" vary by region, but you'll relate to these examples:

• Blooming crocus → plant radishes, parsnips, spinach.
• Daffodils blossom → plant half-hardy vegetables: beets, carrots, chard.

• Forsythia in bloom → safe to plant peas, onion sets, lettuce.
• Dandelions bloom → plant potatoes.
• Maple trees leaf out → plant perennials.
• Quince blossoming → transplant cabbage, broccoli.

• Apple trees bloom → plant bush beans.
• Apple blossoms fall → plant pole beans, cucumbers.
• Lilacs in full bloom → safe for tender annual flowers, squashes.
• Lily-of-the-valley in full flower → transplant tomatoes.
• Full-sized maple leaves → plant morning glory seeds.
• Irises blooming → transplant peppers, eggplant.

• Peonies blossom → safe for heat-loving melons.

While not foolproof, following nature's clock helps us tune into life's rhythm around us.

What signals do you observe where you live?

~ By Robin Sweetser

About This Blog

Get inspired by Robin Sweetser's backyard gardening tips. Robin has been a contributor to The Old Farmer's Almanac and the All-Seasons Garden Guide for many years. She and her partner Tom have a small greenhouse business and also sell plants, cut flowers, and vegetables at their local Farmer's Market.