A marginal aquatic with broad lance-shaped emergent leaves and whorled spikes of small white flowers. Note this species is a declared weed in parts of southern Australia.
At a glance
- Plant type: Aquatic plant
- Mature size: 70 cm H × 50 cm W
- Aspect: full sun
- Water: wet or boggy ground
- Frost: hardy
- Maintenance: moderate maintenance
- Origin: Exotic
About Arrowhead
Sagittaria platyphylla is an fast-growing aquatic plant in the Alismataceae family. It reaches around 70 cm tall and 50 cm wide at maturity, with deciduous foliage. White flowers appear in summer.
Where to grow Arrowhead
Arrowhead suits subtropical, warm-temperate and cool-temperate climates and grows best in full sun. It is frost hardy and shrugs off cold winters.
Soil & planting
Arrowhead does best in clay soil. Dig in plenty of compost before planting, water in well, and mulch to keep roots cool.
Watering & feeding
Arrowhead is wet or boggy ground. A feed in spring with a balanced fertiliser keeps growth strong. In its first year, water deeply once or twice a week to settle the roots in, then taper off as it establishes.
Pruning & care
Prune Arrowhead after flowering to keep it compact and encourage the next flush of blooms. Overall it is moderate maintenance.
Using Arrowhead in the garden
Arrowhead earns its place for a feature or specimen planting and holding soil on banks and slopes.
Companion planting & design
For a cohesive, low-care bed, pair Arrowhead with other plants that enjoy the same wet or boggy ground and subtropical climate. Group three or five together for impact rather than dotting single plants through the garden.
Good to know
Be aware it can self-seed or spread into bushland in some regions — check it is not a declared weed in your area before planting.
Buying Arrowhead
Plant Sale lists Arrowhead as potted plants. Stock isn't live yet — register your interest using the panel above and we'll email you the moment it is available.