What are the growth, flowering and fruiting habits of blueberries?

What are blueberry growth, flowering and fruiting habits? Please describe how blueberries can grow many times in one growing season, with secondary growth being more common. In southern China, blueberry has two growth peaks a year, the first is from May to June, and the second is from mid-July to mid-August. The seedlings grow faster in the third year after planting, and the new branches germinate more and grow vigorously. The annual growth amount can reach more than 1 meter. Flower buds were mostly formed at the top of the branches in the current year, and differentiated downward from the top. The number of flower buds that could be differentiated per branch was related to the variety and branch thickness. Generally, there were 4~7 high bush blueberries and 3~6 rabbit eye blueberries. The flower buds were mainly solitary at the nodes. The flower bud differentiation period of various blueberries is different, short-bush blueberry and high-bush blueberry begin to differentiate from July to August, rabbit-eye blueberry begins from mid-June, and flower bud differentiation of blueberry has been completed from the end of September to the beginning of October. From the morphological point of view, blueberry flower bud hypertrophy, oval or nearly spherical. Below the flower bud are some narrow pointed vegetative buds and dormant buds. The flowering period of blueberry varies significantly with climate and variety. Blueberry blossoms in the first and middle of March in the south of China in normal years and April to May in the north. The flowering period is generally 15~20 days, and the longest is 40 days. Flowers inserted on an elongated rachis, forming racemes. At the same time, the vegetative buds begin to develop into vegetative branches, and the vegetative branches stop growing when they grow to a certain extent (with different lengths). The last thin leaf at the top turns black into a black tip, and the "black tip" falls off about 2 weeks later. After 2~4 weeks, the vegetative buds located under the black tip grow new branches, and have apical dominance, that is, realize the rotation axis growth of branches. This rotation axis grows 3~5 times a year in the south. A bud primordium close to the black spot on the last shoot in summer gradually enlarged and developed into flower bud, occupying the top position. From the top of the flower bud down can also form a number of flower buds, the next spring flowering and fruit. The vegetative buds under them develop into vegetative branches, while the short branches that bear fruits gradually wither and fall off after autumn. Blueberries are mostly cross-pollinated plants. High bush blueberry can be self-fertile, but the degree of fertility is obviously different among varieties; rabbit eye blueberry and short bush blueberry are generally self-sterile, so multi-variety matching should be considered in production to improve yield. After fertilization, the ovaries expand rapidly and tend to stop after about a month, after which the berries remain green and grow only slightly in size. When berries enter the color stage and coloring stage, berries grow rapidly, which can increase the fruit diameter by 50%. After coloring, berries can grow another 20 percent and become moderately sweet and flavorful. The fruits on the same cluster ripen at different times, the top and middle fruits ripen first, and the ripening time is generally from June to August. The ripening period of fruits on the same variety and tree is generally about 30 days. In Majiang, Guizhou and Nanjing, Jiangsu, the ripening period of early ripening varieties of rabbit-eye blueberry begins in the middle of June, and the ripening period of late ripening varieties begins in the first and middle of July. Click for more strawberry growing techniques Click for more fruit growing techniques