Overview

Silverweed (Argentina anserina, syn. Potentilla anserina) is a low, spreading native with silky silver leaf undersides that shimmer in light and cheerful yellow flowers in late spring to summer. It thrives in sun with moist to wet, often sandy or gravelly soils, knits ground with surface runners, and excels along shores, swales, and rain garden edges.

Why You’ll Love It

• Low-maintenance: reliable once established in sun with steady moisture.

• Pollinator-friendly: open flowers feed small native bees.

• Soil stabilizer: dense stolons bind loose soils on banks and shorelines.

Ideal Site & Soil

• Sun first: full sun for the tightest mats and most bloom; light part sun is acceptable in cool sites.

• Moisture matters: prefers moist to wet soils and tolerates periodic inundation.

• Soil texture: thrives in sand, gravel, or silty loam; avoid stagnant, anaerobic muck.

Planting Steps

• From pots or divisions: set crowns at soil line, water to settle, and space 12 to 18 inches so runners can fill in.

• From runners: peg stolons into bare patches to speed coverage.

• From seed: surface sow in late fall or after a brief chill; keep just moist until established.

Care Routine

• Watering: maintain even moisture the first season; later, irrigate during extended dry spells, especially on sand.

• Feeding: average soil is best; high nitrogen encourages lush, floppy growth.

• Mulch: use a thin mineral mulch or a very light organic layer; keep mulch off crowns.

• Grooming: clip spent flower stems and trim runners to keep edges neat.

• Division: lift and replant rooted runners to start new patches or thicken coverage.

Design & Companions

• Shoreline matrix: pair with Bristly Sedge (Carex comosa), Brown Fox Sedge (Carex vulpinoidea), and Blue Vervain (Verbena hastata).

• Rain garden shoulders: weave with Turtlehead (Chelone glabra), Great Blue Lobelia (Lobelia siphilitica), and Switchgrass (Panicum virgatum).

• Textural contrast: combine its silver foliage with Prairie Dropseed (Sporobolus heterolepis) and Joe Pye Weed (Eutrochium maculatum) nearby.

Common Mistakes

• Too dry for too long: results in sparse mats and browning leaves; increase irrigation or shift lower on the slope.

• Deep shade: reduces bloom and slows spread; move to brighter exposure.

• Heavy mulch over crowns: traps moisture and can rot stems; keep collars clear.

Quick Troubleshooting

• Thin coverage: add divisions, peg runners, and improve moisture retention with mineral mulch.

• Yellowing on sand: drought stress; water more deeply and less often.

• Encroaching mats: edge with a spade a couple of times per season to maintain clean lines.

Where It Fits Best

Shorelines, bioswale lips, rain garden shelves, moist paths, and sunny low spots where a low, reflective foliage carpet and soil holding are valuable with minimal care.