ok this is my 1st time growing so i really dont now what im doin, i have 4 plants, i only water them when the soil get dry, using basic house lights(didnt now i needed grow lights till i got on here bout a week ago). they r around 3 weeks old from seed, and they are like almost 2 feet talls, stalks look strong, but they aren't bushy like all the other 3 week plants i see, oh and im using miracle gro potting soil