Starting a Flower Mound from Scratch: Seeds vs. Started Plants

Creating a "flower mound" on a filled-in pond site presents unique challenges: rocky subsoil, unknown soil quality, and weed pressure. Here's how to succeed.

The Seed Reality Check

Johnny-jump-ups (violas) are slow to germinate. Keeping the area moist for them also germinates every weed seed in your 320 lbs of topsoil. You'll struggle to distinguish tiny viola seedlings from weeds.

Better Strategy: Started Annuals

Forget the scattered seeds. Plant established annuals for immediate impact and easier weed identification. Choose based on your light conditions:

Full Sun

• Creeping verbena—fast-spreading color
• Wave petunias—only Wave types cascade vigorously

Shade to Part Shade

• Coleus—foliage color all season
• New Guinea impatiens—larger flowers, better sun tolerance
• Sweet potato vines (purple or lime)—explosive growth in sun or shade

Bonus Groundcover: Spider Plant Offsets

Variegated spider plant "babies" root instantly when tucked into soil. They add grassy texture, variegated color, and multiply continuously—perfect for filling gaps.

Soil Improvement

Since you're on fill over rubble, amend planting holes generously with compost. Mulch heavily to suppress weeds and conserve moisture.

Instant plants beat uncertain seeds every time for new gardeners on difficult sites.