I love these little succulents. Portulacca's come in every color from white to red. They will reseed themselves and provide much welcome color on the hottest days of our summer. There pods contain hundreds of of seeds. When I clean up in the fall I lay the palnts in a collender over a bowl - I bottle and save other areas the following year.
Now I know the name of the plant i have growing out back - they take off like crazy and I found you can even tear some off and root them in water if you want more. Very attractive lookimg.
Jo A - You could try impatiens around your pond. They'll tolerate partial sun and they do great in the shade. Creeping Jenny is also wonderful for ponds - it'll trail into the water!
Don't think portulacca would do very good in shade. I had them there until they were about dead and then moved them to the sunny side and hottest, driest spot.
karianne
PS I tweeted this!