Fellow Reaper grower here and I got my seeds direct from Ed Currie. I've found other capsaicin varieties rather easy to grow - the Reaper took a bit more effort and patience. The seeds took 2 months to germinante - and were quite slow to grow...but the patience has paid off. I expect I'll see fruit on oldest one this season.
I've got several growing at different ages - so I'll just share my biggest / most mature one which is in a 3 gallon planter.
7/22 - plant was about 4 inches tall and just starting to show secondary growth tips.
9/9 - plant is about 22" tall from the top of the soil - but looks like it will be very productive.
And of course - these plants like anything I grow are in a fully amended organic soil...being given nothing but water.
Really excited to try the world's hottest peppers!!! Look forward to seeing others share theirs.
Thanks for starting this Avi!