I have had real good luck with Kester's.. been using their plant products for 4 years and have been really great.
Tip on arrowhead: fill a clear plastic 5-10gal container with pond water, add a pinch of miracle grow and set outside for 3-4 days in the sun, then put duck potato's (arrowhead) bulbs in there. Roots and stems will start, then plant in mud 4-8" deep..
https://www.kestersnursery.com/plant_price_list.htm
