North-facing foundation with screen porch in zone 7 CAN support azaleas — they're shade-tolerant, not shade-requiring. The "azaleas need sun" advice is oversimplified.
Otto Luyken laurel: Good but prone to shot-hole disease. Abelia: Too small (2-3 feet). Your instinct for azaleas is sound — just choose shade-tolerant cultivars.
Don't dismiss azaleas for north-facing shade — they're classic foundation plants for exactly this exposure.
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