Will potted plum blossoms be submerged by heavy rain?

Yes, plum blossoms require high water content, but potted plants can't have water.

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Mei (scientific name: Armenian Mei. ): small trees, sparse shrubs, 4- 10 meters above sea level; Bark light gray or greenish, smooth; Branchlets are green, smooth and hairless. Leaf blade ovate or elliptic, leaf margin usually with small sharp serrations, grayish green. Flowers solitary or sometimes two peanuts in 1 bud, 2-2.5 cm in diameter, with strong fragrance, opening first and then leaves; Calyx is usually reddish brown, but some varieties of calyx are green or green purple; Petals obovate, white to pink. The fruit is nearly spherical, 2-3 cm in diameter, yellow or greenish white, pilose and sour; Mucosal nucleus; The nucleus is oval with slightly flattened sides. It blooms in winter and spring and bears fruit in May-June.