Youre a very smart man. (except youre in the 209 aka the valley) Enjoy the heat this up and coming grow season.. lolol
GDP 8 weeks. Short plant but SOLID nugs. I would HIGHLY recommend for you to top them, (aka super crop) to increase the yield. I have grown GDP with, and without topping. Topping it will increase your yield ENORMOUSLY. By appx 2 1/2 times the yeild if you top it right. Fat stalks seem to take car of many main colas.
Blue Dream has varied as far as I have seen. generally a 9 week plant. A hearty stock that seems to take on a lot of weight. Topping not a must, but recommended. Especially since they will grow taller than your GDP, and you want them the same height.
GDP clones have been lacking the THC they once had. Im guessing too many people have been cloning clones, and cloning clones, over and over and over.. GDP of late seems very average. Not what it once was.
Now Blue Dream... Thats the GDP of yesterday. AMAZING strain. You will be hearing about this one for a while. Make sure to keep 1 clone to mother your next grow.
Enjoy and once again... Great choices!