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Durban Early Detection and Rapid Response

Delta Arrowhead Sagittaria platyphylla

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Common Name
Delta Arrowhead
Classification
Emerging Weed

The Delta Arrowhead originates from North America and is best described as an emergent aquatic typically found in ponds, lakes and slow-moving streams. It is a perennial herb that grows up to 150cm in height, producing underground corns (similar to tubers). Some leaves are totally submerged while others rise just above the surface of the water. Submerged leaves have flattened petioles but no true blades. Emergent leaves have ovate to elliptical blades up to 17cm long. Inflorescence is a raceme with 3-9 whorls of flowers. Flowers are white and up to 2cm in diameter and occur all year round. The plant reproduces by means of stolons, as well as seeds. This plant belongs to the Alismataceae family.

Why is it a problem?
It competes with, and has the potential to replace, indigenous species.
Control method
Physical removal involves either digging by hand or removal through the use of machinery. There are herbicides available for this, which is probably the most cost-effective form of control.
Where is it a problem?
KwaZulu-Natal

Identifying other species

For help with identifying other species, submit your photo and observations to
iSpot: www.ispot.org.za

The iSpot experts may be able to provide a name.

 

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