You can use Mosquito Dunks, you don't have to have a pump in a wildlife pond. They are harmless to pets and other wildlife.

Many pond plants will tolerate shade, my fish pond only gets morning sun and it is lush with plants. Parrot's feather, golden club, azolla, aquatic forget me not, water celery, mare's tail, many different rushes all do fine. Pickeral and waterlilies don't....

Couldn't tell you about hostas, I'm not one to grow non aquatics in the pond.

The only non-aquatics I've planted in the pond are impatiens, and having experience with them, I feel confident that with soil in the pots, the roots of the hostas will likely rot if they're in a constantly wet environment. Better to buy them barefoot, or you can gently rinse the soil off yourself. Then anchor them in the rocks around the edge of the pond, or if your prefer, fill the pots with small gravel and plant the roots in that.

I've put hosta in floating foam "islands" before with great success - bare root, no planting medium. I think Nancy has a good idea on anchoring them with gravel or pebbles.

I've had great luck with growing hostas in the pond, but it's worked better for me if I only allow the roots to be submerged in the water so I usually prop up the plant so that the stems are just above the water. Best of luck!

robin and nancy,
I'm the one who said Hosta's would grow in water, and I don't think I actually gave a medium for the roots. I do have a Hosta in my stream, so even though it IS in soil, it is in flowing water and only partially covered. It is going strong after 3 years.