Pomelo main place of origin in: China south of the Yangtze River, the northernmost limit is found in Henan Province, Xinyang and Nanyang area, all cultivated, Southeast Asian countries have planted.

The pomelo is a tree. The shoots, leaf backs, pedicels, calyx and ovary are all pilose, and the young leaves are usually dark purplish red, and the shoots are flat and angular. Leaves are quite thick, color green, broadly ovate or elliptic, with Ji leaf 9-16 cm long, 4-8 cm wide, or larger, tip obtuse or rounded, sometimes mucronate, base rounded, winged leaves 2-4 cm long, 0.5-3 cm wide, individual varieties of the winged leaves are very narrow.

Racemose inflorescences, sometimes with axillary single flowers; flower buds light purplish-red, sparsely creamy-white; calyx irregularly 5-3-lobed; petals 1.5-2 cm long; 25-35 stamens, sometimes partially sterile; styles stout and long, stigmas slightly larger than the ovary.

Expanded information:

The root system of pomelo consists of primary roots, lateral roots and fibrous roots. The growth of pomelo tree and the yield is mainly determined by the quantity and quality of the fibrous roots. Pomelo, like other citrus, belongs to mycorrhizal plants, and the root system mainly relies on the mycorrhizal fungal hyphae to absorb nutrients and water, therefore, improving mycorrhizal growth conditions and promoting mycorrhizal growth is an important task in its orchard management.

The buds of pomelo are precocious, and can be pumped out many times a year, making it easy to form a canopy. Pomelo's branches and trunks are still in a dormant state of hidden buds, stimulation will prompt hidden buds sprouting, developing into new branches, which is the basis for renewing and reinvigorating the tree.

In Guizhou pomelo generally in a year to produce three new shoots, namely spring, summer and fall shoots. Pomelo's branch tip branching angle has a great impact on growth and results, branching angle is small, branch tip draw upright, its apical dominance is strong, vigorous growth, less nutrient accumulation, is not conducive to the differentiation of flower buds, while the horizontal branch and pendulous branch is the opposite.

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