Delaware in USDA Zone 7
Delaware is primarily in Zone 7. Local microclimates can vary.
Growing Ground Covers in Delaware
Zone 7 gardeners hit the sweet spot for ground cover diversity, with a generous 210-day growing season that supports everything from delicate woodland varieties to tough Mediterranean herbs. The moderate climate means you can grow both cool-season favorites like Sweet Woodruff and heat-lovers like Sedum 'Dragon's Blood' in the same garden. However, Zone 7's transitional nature brings unique challenges – sudden temperature swings in late winter can damage tender new growth, and the relatively long, hot summers can stress shallow-rooted ground covers if you don't choose wisely.
The key to success in Zone 7 is selecting varieties that can handle both the occasional bitter cold snap and the summer heat waves that are becoming increasingly common. Look for ground covers with proven drought tolerance once established, good cold hardiness, and the ability to bounce back from weather extremes. Dense, spreading varieties work particularly well here since they can establish quickly during the long growing season and form protective mats that help moderate soil temperature swings.
Zone 7 Ground Covers for Delaware
24 varieties · Last frost April 1 · 210-day season
Zone 7 Growing Tips for Delaware
Spring planting works best for most ground covers in Zone 7 – aim for 2-3 weeks after your average last frost (so mid to late April) when soil temperatures have warmed but you still have the full growing season ahead. This timing is crucial for varieties like Ajuga and Creeping Jenny that need time to establish extensive root systems before summer heat arrives. Fall planting can work for hardy varieties like Vinca Minor and Pachysandra, but get them in the ground by early September to allow 6-8 weeks of root development before first frost.
Zone 7's variable spring weather means paying attention to microclimates in your yard. South-facing slopes and areas near concrete or stone warm up faster and may experience more temperature swings, making them better suited for heat-tolerant, resilient varieties like Creeping Thyme or Sedum. Shadier north sides and low-lying areas stay cooler longer and suit woodland species like Wild Ginger and Japanese Painted Fern. During establishment, consistent moisture is critical – Zone 7's hot, often humid summers can quickly stress new plantings if you let them dry out.