I just saw water hyacinth at Star Garden in Moiliili. Wally's a few blocks away has various water plants.

The lotus root that you buy that has a sprout can grow also water chestnuts .
Try Asian food markets .

They sometimes sells those at Pets N' Plants in Waimalu Shopping Center. Look for other aquarium pet stores to see if the have it.

I like water lily. They can be purchased at Home Depot and many garden stores. I also raise a small (about 3 inch diameter white) in two ceramic pots that average three flowers in bloom all year long. I really like them.

The lotus plant I saw at Oahu Urban Garden Center was pretty.

You guys are so lucky you have a water garden! You could stock it with lotus, and have those beautiful flowers. Home Depot at Pearl City is selling it.

In reply to your question where to get water plants 1253 ulupii st kailua hi 96734 8082612003

I thought that water hyacinth and water lettuce are considered invasive, and are not supposed to be sold. Your best bet is to find someone who has them and get a few; they do multiply quickly.

Is there a water garden club on Oahu? That would be a valuable resource.

Hyacinth get larger and bloom better in still water. They float, but can get blown around a pond, and that can keep them small.