Arrowhead

About Arrowhead

Arrowhead is a marginal aquatic perennial grown for its upright, arrow-shaped leaves and bright white summer flowers. It brings a clean, structured look to pond edges while still fitting naturally into wildlife-style water gardens.

The foliage rises in tidy vertical ranks from the crown, which gives the plant a strong rhythm along shallow shelves and wet margins. When it flowers, the effect becomes softer, with white three-petaled blooms held above the leaves where they catch the light over the water.

Arrowhead is especially useful where a pond edge needs both form and coverage. A few clumps can act as accents, while larger plantings create a more natural habitat look with repeated shape and movement.

Once established, it can spread steadily by stolons and form a confident colony. That makes it reliable and effective, but also means it is best placed where its growth can be managed if needed.

How to Care for Arrowhead

Watering

Treat Arrowhead as a true marginal plant and keep it in constant access to water. The crown should never dry out during active growth, and the soil should stay saturated or sit in shallow water.

If it is grown in a bog bed, water often enough to keep the soil wet all the way down, especially in warmer weather.

Sunlight

Grow Arrowhead in full sun for the strongest flowering and the most upright growth. Bright exposure also helps the plant keep its clean, energetic look through the season.

It can tolerate partial shade, but flowering is usually lighter and the overall plant may look less vigorous.

Temperature

Arrowhead is well suited to moderate outdoor temperatures and handles cool weather in many temperate climates. It usually performs well through the normal growing season as long as the water conditions remain suitable.

Stable water levels are especially helpful in hot weather. Poor, stagnant, or overly warm water is usually more limiting than normal seasonal temperature changes.

Humidity

Humidity is rarely a major issue for Arrowhead, but good airflow still matters around the foliage and crown. Crowded, stale conditions can reduce the freshness of the planting over time.

Give clumps enough room to breathe, and in smaller ponds a little gentle water movement can help keep the setting healthier without creating fast flow.

Soil

Use rich organic soil that stays continuously wet. Fertile mud or heavy loam is ideal because it holds nutrients well while anchoring the plant securely.

In containers, a loam-based aquatic mix topped with gravel works especially well. Thin, sandy mixes are less suitable unless the plant is growing directly in shallow water with access to richer silt.

Pests and Problems

Arrowhead is often easy to grow, but its main issue can be its strong spreading habit. Once settled, it may extend by runners and form larger patches than expected.

If you want a tidier or more controlled planting, grow it in a basket or on a defined shelf and thin extra stolons as needed. In areas near natural waterways, it is also wise to prevent unwanted spread beyond the garden.