A gardener in Coeur d'Alene, Idaho (Zone 5) asked when to plant clematis, gladiolus, iris, and other "bulbs." Clarification: these are different underground structures with different planting windows.
Average last frost: April 20 – May 1. Plant hardy items after hard frost danger passes; wait for warm soil for tender types.
| Plant | Structure | Planting Time | Notes |
|---|---|---|---|
| Clematis | Woody vine (roots) | Early spring (April) | Plant 2" deeper than pot level. Mulch heavily. |
| Iris (Bearded) | Rhizome | Late summer (July–Sept) ideal; early spring OK | Plant rhizome at soil surface, roots down. Don't bury. |
| Gladiolus | Corm | Mid-May (soil 55°F+) | Not hardy in Zone 5. Dig corms in fall after frost kills tops. Store 35–45°F. |
| True Bulbs (Tulip, Daffodil, Hyacinth, Lily) | Bulb | Fall (Sept–Oct) for spring bloom | Spring planting = no bloom first year. Plant 3× bulb depth. |
Plant clematis and hardy perennials now. Wait until mid-May for gladiolus. Order spring bulbs for fall planting. Mark calendar to dig gladiolus corms after first frost.
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