Sedum and stonecrop care: zone hardiness and the Autumn Joy crown rot trap

Autumn Joy sedum thrives in lean, dry, well-drained soil in full sun. Crown rot and flopping are both cultural problems -- wet soil and too much shade or fertility.

I have grown 'Autumn Joy' sedum — now correctly named Hylotelephium 'Herbstfreude' — in a full-sun corner of my Long Island yard for nine years. It has required exactly three things from me: a site that drains well, full sun, and very little else. The plant comes back every spring from the same crown, spreads slowly, blooms reliably in September, and holds its seed heads through winter for birds and structure. It is one of the most trouble-free plants in my garden with one meaningful caveat: if you grow it in rich, moist soil or shade, it flops. And in genuinely wet or fertile soil, the crown can rot.

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Upright sedums vs. creeping sedums

The plant sold as "sedum" covers a wide range of habits, from flat ground-hugging creepers to upright 2-foot perennials. The care requirements are broadly similar but the garden uses are different.

Upright sedums (Hylotelephium / tall sedum group)

These are the familiar autumn-blooming garden perennials: 'Autumn Joy' (correctly Hylotelephium 'Herbstfreude'), 'Matrona', 'Autumn Fire', and the Sedum spectabile cultivars like 'Brilliant'. They grow 1.5 to 2 feet tall per Missouri Botanical Garden, with broad, flat-topped flower clusters that age from pink to deep rusty red through September and October. The genus name changed from Sedum to Hylotelephium in many classifications, but both names are used in trade.

Per NC State Extension Plant Toolbox, Hylotelephium spectabile is hardy in zones 4a through 9b. Per Missouri Botanical Garden, 'Autumn Joy' specifically is hardy in zones 3 to 9.

Creeping sedums

Low ground-covering sedums (Sedum acre, S. rupestre 'Angelina', S. spurium, S. sexangulare) grow 2 to 6 inches tall and spread to cover the ground. They are excellent for rock gardens, dry walls, and areas too dry and harsh for most plants. The care principles are the same — excellent drainage, full sun, lean soil — but they are essentially maintenance-free once established.