Seasonal Maintenance Guide
- Remove winter mulch gradually in late April as soil warms
- Prune lavender lightly before new growth begins, removing any winter damage
- Cut back Russian sage and ornamental grasses to 6 inches in early spring
- Improve drainage in planting beds with sand and compost amendments
- Plant new perennials and herbs after frost danger passes in mid to late May
- Divide overgrown clumps of catmint, thyme, and sedums
- Harvest lavender when half the flowers are open for peak fragrance and oil
- Deadhead catmint and coreopsis after first flush for extended bloom
- Water new plantings deeply but infrequently to develop drought tolerance
- Allow established Mediterranean plants to thrive on natural rainfall
- Harvest culinary herbs regularly to encourage bushy growth
- Monitor for Japanese beetles on sun-loving perennials
- Plant spring bulbs like alliums among Mediterranean plants in October
- Leave ornamental grasses and sedum seed heads for winter interest
- Cut back spent perennial foliage after hard frost
- Apply 3-4 inches of mulch after ground freezes for winter protection
- Bring tender rosemary and citrus containers indoors before first frost
- Clean and store terracotta containers that may crack in winter
- Check winter mulch after heavy snows and thaws, replenish if needed
- Monitor indoor rosemary for adequate light and careful watering
- Plan new planting areas and order cold-hardy Mediterranean varieties
- Prune tender herbs indoors for winter culinary use
- Design drainage improvements for spring installation
- Research Iowa-adapted Mediterranean plants for coming season