Begonias

This is the Champagne Begonia. I am smitten with this plant. I have never had the desire to grow a Begonia before, but as soon as I saw this, I knew I had to have it. The flowers look like you could eat them. And I have the perfect place it. It will look stunning in several pots on the front porch, which gets a little morning sun and has a trellis covering. The only thing is, to get them started, you need to plant the bulbs in shallow pots three months ahead of time and sprout them in a 70 degree room. Will a 65 degree room work? I'm not jacking up the thermostat for a plant. Does anyone have experience growing Begonias? I so want this plant on my front porch.