2020 Wild Blueberry Phenology Record

Please reference the Maine Wild Blueberry Phenology Guide (PDF) (PDF), for detailed stage identification.

For mapped locations please return to the Real-Time Wild Blueberry Phenology Tracker. See Development Stages Below.

Week of June 1

Frost events occurred on 2 nights during full bloom: May 31 and June 1. Frost damage evidenced by brown flowers is present in all locations. Red-tinted leaves, likely indicating stress from frost damage, is also present in all locations.

Week of June 15

A pink blushing color can occur on green fruit due to stress (heat or dry conditions). We attempted to quantify the percent of the fruit that has currently developed into healthy green fruit.

		Location
Cycle	Week	Brunswick	Waldoboro	Hope	Searsport	Ellsworth	Deblois	Montegail	Jonesboro	Marion	Crawford
Prune Cycle	Sept. 21st 2020	—	Average of 3.04 buds per stem.	Average of 3.21 buds per stem.	Average of 3.58 buds per stem.	Average of 3.80 buds per stem.	Average of 7.00 buds per stem.	Average of 4.60 buds per stem.	Average of 3.70 buds per stem.	Average of 3.54 buds per stem.	Average of 3.79 buds per stem.
Prune Cycle	Sept. 14th 2020	—	Average of 2.95 buds per stem.	Average of 3.50 buds per stem.	Average of 4.00 buds per stem.	Average of 3.08 buds per stem.	Average of 4.80 buds per stem.	Average of 4.80 buds per stem.	Average of 3.70 buds per stem.	Average of 3.04 buds per stem.	Average of 4.25 buds per stem.
Prune Cycle	Sept. 7th 2020	—	Average of 2.42 buds per stem.	Average of 2.75 buds per stem.	Average of 3.50 buds per stem.	Average of 2.95 buds per stem.	Average of 4.40 buds per stem.	Average of 6.10 buds per stem.	Average of 3.20 buds per stem.	Average of 2.04 buds per stem.	Average of 3.80 buds per stem.
Prune Cycle	August 31st 2020	—	Average of 2.4 buds per stem.	Average of 2.9 buds per stem.	Average of 3.1 buds per stem.	Average of 3.8 buds per stem.	Average of 2.4 buds per stem.	Average of 2.6 buds per stem.	Average of 3.3 buds per stem.	Average of 0.9 buds per stem.	Average of 3.2 buds per stem.
Prune Cycle	August 24th 2020	—	Average of 1.8 buds per stem.	Average of 2.6 buds per stem.	Average of 2.7 buds per stem.	Average of 2.2 buds per stem.	Average of 2.5 buds per stem.	Average of 2.0 buds per stem.	Average of 2.3 buds per stem.	Average of 0.4 buds per stem.	Average of 1.6 buds per stem.
Prune Cycle	August 17th 2020	—	Average of 1.1 buds per stem.	Average of 2.6 buds per stem.	Average of 1.8 buds per stem.	Average of 3.3 buds per stem.	—	—	—	Average of 1.3 buds per stem.	Average of 2.7 buds per stem.
Crop Cycle	August 3rd 2020	—	2% Green, 2% Red, 91% Blue (11.9 Brix), 4% Not Marketable.	7% Green, 3% Red, 78% Blue (12.8 Brix), 12% Not Marketable.	8% Green, 2% Red, 83% Blue (12.7 Brix), 8% Not Marketable.	—	26% Green, 2% Red, 72% Blue.	6% Green, 2% Red, 92% Blue.	22% Green, 2% Red, 76% Blue.	2% Green, 2% Red, 84% Blue (15.54 Brix), 4.3% Not Marketable.	1% Green, 2% Red, 81% Blue (11.0 Brix), 15% Not Marketable.
Crop Cycle	July 27th 2020	—	Rockport 4% green, 4% red, 86% blue (Brix 13.0), 5% not marketable.	6% green, 5% red, 83% blue (Brix 13.2), 6% not marketable.	Stockton Springs 11% green, 1% red, 83% blue (Brix12.9), 6% not marketable.	Dedham 7% green, 0% red, 89% blue (Brix 14.3), 2.5% not marketable.	Surry 0.9% green, 2.5% red, 76% blue, 1% not marketable.	—	12.4 Brix.	19% green, 0% red, 72% blue (Brix 13.5), 3% not marketable.	4% green, 0% red, 81% blue (Brix 12.2), 12% not marketable.
Crop Cycle	July 20th 2020	—	Rockport 19% green, 11% red, 68% blue, 2% not marketable.	25% green, 9% red, 65% blue, 2% not marketable.	Stockton Springs 37% green, 5% red, 57% blue, 1% not marketable.	Dedham 27% green, 5% red, 61% blue (10.9 Brix), 5% not marketable.	Franklin 5% green, 4% red, 79% blue, 12% not marketable.	—	11.3 Brix.	45% green, 12% red, 40% blue (11.1 Brix), 3% not marketable.	15% green, 4% red, 74% blue (10.6 Brix), 7% not marketable.
Crop Cycle	July 13th 2020	Green, pink, and blue berries.	Rockport 74% Green fruit, 14% Pink fruit, 12% Blue fruit.	59% Green fruit, 6% Pink fruit, 34% Blue fruit.	Stockton Springs 63% Green fruit, 3% Pink fruit, 33% Blue fruit.	Green, pink, and blue berries.	Green, pink, and blue berries.	Green, pink, and blue berries.	Green, pink, and blue berries.	85% Green fruit, 3% Pink fruit, 11% Blue fruit.	37% Green fruit, 8% Pink fruit, 54% Blue fruit.
Crop Cycle	July 6th 2020	Green and pink berries.	Green, pink, and blue berries.	Green, pink, and blue berries.	Green, pink, and blue berries.	Green, pink, and blue berries.	Green, pink, and blue berries.	Green, pink, and blue berries.	Green, pink, and blue berries.	Green, pink, and blue berries.	Green, pink, and blue berries.
Prune Cycle	July 6th 2020	No tip dye back yet.	Tip dye back present.	Tip dye back present.	Tip dye back present.	Tip dye back present.	No tip dye back yet.	Tip dye back present.	Tip dye back present.	No tip dye back yet.	Tip dye back present.
Crop Cycle	June 1st 2020	Tight cluster (T4), closed flower (T5), and bloom present.	Pin heads and bloom present.	Pin heads and bloom present.	Pin heads and bloom present.	Pin heads and bloom present.	Closed flower (T5), bloom, and pin heads present.	Pin heads and bloom present.	Closed flower (T5), bloom, and pin heads present.	Majority bloom. Closed flower (T5) and pin heads present.	Closed flower (T5), bloom, and pin heads present.
	June 8th 2020	Majority bloom. Pin heads present.	Majority green fruit. Pin heads present.	Majority pin heads and green fruit. Bloom present.	Majority pin heads and green fruit. Bloom present.	Majority pin heads and green fruit. Bloom present.	Majority pin heads and green fruit. Bloom present.	Majority pin heads and green fruit. Bloom present.	Majority pin heads and green fruit. Bloom present.	Majority bloom. Pin heads present.	Majority pin heads. Green fruit and bloom present.
	June 15th 2020	—	Majority green and blushing fruit. Estimate 85% healthy green fruit.	Majority pin heads and green fruit. Estimate 87% healthy green fruit	Majority green and blushing fruit. Estimate 60% healthy green fruit.	Majority green and blushing fruit. Estimate 76% healthy green fruit.	Majority pin heads and green fruit. Estimate 98% healthy green fruit.	Majority green fruit. Pin heads and blush present. Estimate 94% healthy green fruit.	Majority pin heads and green fruit. Estimate 90% healthy green fruit.	—	—
	June 22nd 2020	Majority green fruit.	Majority green fruit.	Majority green fruit.	Majority green fruit.	Majority green fruit.	Majority green fruit.	Majority green fruit.	Majority green fruit.	Majority green fruit.	Majority green fruit.
	June 29th 2020	—	Majority green berries. Pink and blue berries present.	Majority green fruit. Pink berries present.	Majority green fruit. Pink and blue berries present.	Majority green fruit. Pink and blue berries present.	Majority green fruit. Pink and blue berries present.	Majority green fruit. Pink and blue berries present.	Majority green fruit. Pink and blue berries present.	Majority green fruit.	Majority green fruit. Pink and blue berries present.
Crop Cycle	May 4th 2020	Majority is Bud Swell (T1), Dry Field.	Majority is Tight Cluster (T4), Early Flower is Present (T5).	Half is Bud Burst (T3), Half Early Bud Burst (T2).	Majority is Tight Cluster (T4). Early Flower is Present (T5).	Majority is Bud Burst (T2 and T3). Bud Swell is Present (T1).	—	—	—	Half is Bud Burst (T3), Half Early Bud Burst (T2).	Majority is Bud Burst (T2 and T3). Bud Swell is present (T1).
	May 11th 2020	Majority is Bud Swell (T1), Dry Field.	Majority is Tight Cluster (T4), Closed Flower (T5) is Present.	Majority is Bud Burst (T3).	Majority is Tight Cluster (T4). Closed Flower (T5) is Present.	Majority is Bud Burst (T2 and T3). Tight Cluster (T4) is Present.	Majority is Bud Burst (T2 and T3). Bud Swell (T1) is Present.	Majority is Bud Burst (T2 and T3). Tight Cluster (T4) is Present.	Majority is Bud Burst (T3). Tight Cluster (T4) is Present.	Majority is Bud Burst (T2 and T3). Bud Swell (T1) is Present.	Majority is Bud Burst (T2 and T3). Bud Swell (T1) is Present.
	May 18th 2020	—	Majority is Closed Flower (T5).	Majority is Bud Burst (T3) & Tight Cluster (T4). Closed Flower (T5) is Present.	Majority is Closed Flower (T5). Bloom is Present.	Majority is Tight Cluster (T4), & Closed Flower (T5).	Majority is Bud Burst (T3). Tight Cluster (T4), & Closed Flower (T5) are Present.	Majority is Tight Cluster (T4), & Closed Flower (T5).	Majority is Tight Cluster (T4), & Closed Flower (T5). Bloom is Present.	Majority is Tight Cluster (T4). Bud Burst (T3) is Present.	Majority is Tight Cluster (T4), & Closed Flower (T5).
	May 25th 2020	—	50.86% Bloom. Closed flower (T5) and petal fall present.	30.44% Bloom. Closed flower (T5) and petal fall present.	50.54% Bloom. Closed flower (T5) present.	51.87% Bloom. Closed flower (T5) present.	37.54% Bloom. Closed flower (T5) present.	41.21% Bloom. Closed flower (T5) present.	30.15% Bloom. Closed flower (T5) present.	3.59% Bloom. Tight cluster (T4) and closed flower (T5) present.	37.54% Bloom. Closed flower (T5) present.
Prune Cycle	May 18th 2020	—	Emergence.	Emergence.	Emergence.	Emergence.	—	—	Emergence.	Emergence.	—
Prune Cycle	May 25th 2020	—	Green tip to 10 leaves open.	Green tip to 10 leaves open.	Green tip to 10 leaves open.	Green tip to 8 leaves open.	Green tip to 4 leaves open.	Green tip to 8 leaves open.	Green tip to 8 leaves open.	Green tip to 4 leaves open.	Green tip to 4 leaves open.
Crop Cycle	April 6th 2020	Majority is bud swell (T1).	Majority is bud swell (T1) + Early Green Tip.	Majority is bud swell (T1).	Majority is bud swell (T1).	Majority is bud swell (T1).	Majority is bud swell (T1).	—	—	—	—
	April 13th 2020	Majority is bud swell (T1).	Majority is bud swell (T1). Bud burst is present (T1 and T3).	Majority is bud swell (T1). Beginning bud burst is present (T2).	Majority is bud swell (T1). Beginning bud burst is present (T2).	Majority is bud swell (T1). Beginning bud burst is present (T2).	Majority is bud swell (T1).	Majority is bud swell (T1). Beginning bud burst is present (T2)	Majority is bud swell (T1). Beginning bud burst is present (T2)	—	—
	April 20th 2020	Majority is bud swell (T1).	Majority is bud swell (T1). Bud burst is present (T2 and T3).	Majority is bud swell (T1). Beginning bud burst is present (T2).	Majority is bud swell (T1). Beginning bud burst is present (T2).	Majority is bud swell (T1). Beginning bud burst is present (T2).	Majority is bud swell (T1).	Majority is bud swell (T1). Beginning bud burst is present (T2)	Majority is bud swell (T1). Beginning bud burst is present (T2)	—	—
	April 27th 2020	Majority is bud swell (T1).	Majority is Bud Burst (T3). Early Bud Burst is present (T2)	Majority is Bud Swell (T1). Early Bud Burst is present (T2)	Majority is Early Bud Burst (T2). Bud Swell (T1) and Bud Burst are present (T3).	Majority is Bud Swell (T1). Early Bud Burst is increasing (T2).	Majority is Bud Swell (T1)	Majority is Bud Swell (T1). Early Bud Burst is increasing (T2).	Majority is Bud Swell (T1). Early Bud Burst is increasing (T2)	Majority is Early Bud Burst (T2). Bud Swell (T1) and Bud Burst are present (T3)	Majority is Early Bud Burst (T2). Bud Swell (T1) and Bud Burst are present (T3)