Spacing will depend on the ultimate height and spread of the particular species. Choose a location in sun or light shade (the latter being preferable in zones farther south). While widely tolerant of soil types, Philadelphus prefers a moisture-retentive but well-drained soil. Mulch at planting time. Plants will begin to bloom in about three years, once they’re established.
We recommend an annual application of mulch. Water well during periods of drought. A thorough pruning should be undertaken after flowering; remove old wood at this time to promote better growth habit and flower production. Add bonemeal or superphosphate in spring or fall to encourage flowering.