Four O'Clocks Thriving on One Side Only: Soil Amendment Strategy

Four o'clocks (Mirabilis jalapa) flourishing on the north side but failing south of the sidewalk points to a soil composition difference—not light, since both sides get similar exposure.

Soil Building Plan

Start this fall and repeat in spring:

1. Add organic matter: compost, aged manure, peat moss
2. Incorporate shredded leaves and dried grass clippings
3. Next spring: Apply garden lime to raise pH ("sweeten" soil)

Why This Works

Four o'clocks prefer rich, well-drained, slightly alkaline soil. The south-side bed likely lacks organic matter, has poor structure, or is too acidic. Building soil fertility and adjusting pH creates the conditions they need.

Simple, Effective, Patient

No fancy products needed. Consistent organic amendments transform poor soil over a season or two. Your thriving north-side plants prove you know the culture—now match the soil.