PSA: this species, while a slow grower, is not a natural dwarf; it can get 10-18' tall, and some as tall as 70' in their natural habitat. You're thinking of var. mughus/mugo, var. pumilio, or any one of the wide variety of dwarf cultivars.
Needles in twos, held for 4+ years. Prefer cool summers. Unlike some other pines, tolerates alkaline soils. Deep rooting habit disappears in shallow, poorly-drained soils. Only Missouri BG claims clay tolerance, and even then not strongly enough to actually put it on their list, while the USDA denies it.
Susceptible to scale.
Sources: UFL, Sunset, Stoecklein, Cal Poly, Missouri BG, UConn, NCSU, USDA.
Buy it (var. mughus/mugo) or 'Slowmound' at PlantingTree.com (affiliate link; supports this website)
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