pirl said:...Open the bag but do not water until you spot growth...
This was the hardest thing ever for me to get used to...
no initial watering...
I thought surely I'd fail...but it's true.
If you don't want to stake, try the Hypnotica® series. They're available at garden centers, and the plants are very full, short and will bloom heavily throughout the season without much fuss.
This picture was taken at the tail-end of our gardening season last year...the plants shown are the biggest they'll ever be.