are there such things for gardening as solar

You r going to pay more for a solar pump, but it will be worth it by what u save in the longrun. I would go definitely higher than a 2watt - those r very weak. more if u r using it for ur filter & fountain, etc. They will be able to help u choose what is right for ur pond size & what u r hooking up. No matter where u go, be sure the pump will store energy for cloudy day/nightime operation. Many times, this is a battery pack add-on ;) I would just do a search & compare- & ask alot of questions before u buy.

I saw something that may work at Rona a few weeks ago. It is a fake rock with a smallish solar panel on it that you could plug your pump for your waterfall into. I think it was around 50 bucks, but i am not sure. Try Rona or Home depo or even canadian tire. They should have something that can help you.