Phenological development of low sweet blueberry varies according to
geographic location and specific weather conditions [22,62].
Temperature and day length are important regulatory influences [72,76].
Initial floral development begins in the year prior to flowering and
fruiting . Floral bud primordia appear during June and early July
 when day length reaches approximately 15 hours . Development
may continue until late October if air temperatures remain above 32
degrees Fahrenheit (0 deg C) with long periods above 50 degrees
Fahrenheit (10 deg C) . Leaves harden by mid-July, color by late
August, and abscise by late October [72,119].
Plants are dormant in fall  and overwinter in a leafless state
. Active annual growth can begin as early as March or April ,
but in many areas, both vegetative and flower bud development begins in
early May after air temperatures have exceeded 50 degrees Fahrenheit (10
deg C) for a least 3 to 4 consecutive days . Vegetative shoots
grow until midsummer .
Plants generally flower in May or June of their 2nd year [72,167]. A
few flowers may open as early as March in unusually good years, and some
plants occasionally flower as late as September or October .
Flowering may be delayed by 2 or 3 weeks in cool, coastal areas .
Fruit generally ripens from midsummer to late summer, approximately 50
days after anthesis . In an Ontario study, seed dispersal began
from June 11 to June 20, peaked in early July, and ended in September
. Generalized flowering and fruiting dates for various locations
are as follows:
Location Flowering Fruiting
VA May-June July-August 
NS June-late July early-mid-August [72,157]
Pictou Co.,NS ---- July 17- Oct. 27 
ME ---- mid July-August 
MI May-June July-August 
NJ April ---- 
ON May-early June June-September [153,154,141].
- 3. Aalders, L. E.; Hall, I. V. 1964. A comparison of flower-bud development in the lowbush blueberry Vaccinium angustifolium Ait. under greenhouse and field conditions. Proceedings of the American Society for Horticultural Science. 85: 281-284. 
- 22. Bell, Hugh P.; Burchill, Jane. 1955. Flower development in the lowbush blueberry. Canadian Journal of Botany. 33: 251-258. 
- 44. Crossley, John A. 1974. Vaccinium L. Blueberry. In: Schopmeyer, C. S., ed. Seeds of woody plants in the United States. Agric. Handb. 450. Washington, DC: U.S. Department of Agriculture, Forest Service: 840-843. 
- 62. Frank, R.; Sirons, G. J.; Campbell, R. A.; Mewett, D. 1983. Residues of 2,4-D dichlorprop and picloram in wild berries from treated rights-of-way and conifer release sites in Ontario, 1979-1981. Canadian Journal of Plant Science. 63: 195-209. 
- 72. Hall, Ivan V.; Aalders, Lewis E.; Nickerson, Nancy L.; Vander Kloet, Sam P. 1979. The biological flora of Canada. I. Vaccinium angustifolium Ait., sweet lowbush blueberry. Canadian Field-Naturalist. 93(4): 415-430. 
- 76. Hall, I. V.; Ludwig, R. A. 1961. The effects of photoperiod, temperature, and light intensity on the growth of the lowbush blueberry (Vaccinium angustifolium Ait.). Canadian Journal of Botany. 39: 1733-1739. 
- 77. Hancock, James F.; Draper, Arlen D. 1989. Blueberry culture in North America. HortScience. 24(4): 551-556. 
- 83. Hoefs, M. E. G.; Shay, Jennifer M. 1981. The effects of shade on shoot growth of Vaccinium angustifolium Ait. after fire pruning in southeastern Manitoba. Canadian Journal of Botany. 59: 166-174. 
- 119. Pritts, Marvin P.; Hancock, James F. 1984. Independence of life history parameters in populations of Vaccinium angustifolium (Ericaceae). Bulletin of the Torrey Botanical Club. 3(4): 451-461. 
- 141. Soper, James H.; Heimburger, Margaret L. 1982. Shrubs of Ontario. Life Sciences Misc. Publ. Toronto, ON: Royal Ontario Museum. 495 p. 
- 150. Uttal, Leonard J. 1987. The Genus Vaccinium L. (Ericaceae) in Virginia. Castanea. 52(4): 231-255. 
- 151. Vander Kloet, S. P. 1976. A novel approach to sampling Vaccinium populations. Canadian Journal of Botany. 54: 669-671. 
- 153. Vander Kloet, S. P. 1976. A comparison of the dispersal and seedling establishment of Vaccinium angustifolium in Leeds Co., Ontario and Pictou Co., Nova Scotia. Canadian Field-Naturalist. 90(2): 176-180. 
- 154. Vander Kloet, S. P. 1978. Systematics, distribution, and nomenclature of the polymorphic Vaccinium angustifolium. Rhodora. 80: 358-376. 
- 157. Vander Kloet, S. P. 1988. The genus Vaccinium in North America. Publication 1828. Ottawa: Research Branch, Agriculture Canada. 201 p. 
- 167. Wood, F. A.; Barker, W. G. 1963. Stem pigmentation in lowbush blueberry. Plant Physiology. 38: 191-193. 
- 171. Yarborough, David E.; Hoelper, Antonia L. 1986. Broom grass control in lowbush blueberry fields using postemergence herbicides. In: Proceedings of the 40th Annual Meeting of the Northeastern Weed Science Society; [Date of conference unknown]
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