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What pH should my soil be for Lily bulbs?

Sandy loam soil, rich in humas, with a pH of about 5.5 to 6.5 is the textbook ideal. However, most varieties can tolerate more acidity or even slightly alkaline soil and still produce good results. In general, Orientals do best if soil is amended with peat moss or other components to achieve at least slight acidity. Asiatics, Lilium martagon, L. henryi, L. regale, L. pumilum (and their hybrids) perform wonderfully in neutral to slightly alkaline soils in all climate zones. Trumpets will grow happily with slightly alkaline conditions, but need protection from severe late spring frosts if sprouts have emerged.

Wild Lilies
Timely Tips!
Wild Lily bulbs making up the genus Lilium belong to the family Liliaceae comprising of approximately 200 genera made up of approximately 2,000 lily species. There are in the neighborhood of 110 to 120 Lilium species depending on whose classification you reference. For the full article, click Knowledge Base