Just wondering: where to put them outdoors when the danger of frost passes? I would prefer to keep them in containers.

I have totally flat small city backyard with some shrubs and spring bulbs. How begonias are usually ised in landcape: along the path, each in own pot and pots grouped together, or one big (how big?) container to look like a bed of annuals, anything else?

I could imagine pots on a nice metal plant supports, but they are too expensive.
Also, what size of the pot is common for growing non-stop begonias, 8-10 inches (25 cm diameter) for each plant?

Thanks.

Also if you keep them in pots, make sure you remember to water them. Don't water until the top 1" of the soil is dry but then water thoroughly so the water drains from the bottom. They can not handle standing water.

Fertilize them every 14 days with 1/2 tsp Peters 20-20-20 or Miracle Grow 15-30-15 per gallon of water, or use 1 tsp OSMOCOTE every 2-3 months.