Seeds from Galtonia candicans Spire Lily or Summer hyacinth. Fragrant, bell-shaped white flowers, tinged with green, and strap type foliage make this plant perfect in the late summer garden. Grow in fertile, well-drained soil that is reliably moist in spring and summer. Full sun. Overwinter in a cool greenhouse or mulch deeply in areas with harsh winters. Growing 3-6 feet in zones 7 to 10.