It is possible to grow Harlequin without trips to the grow store.
Direct sunlight is best. Solar is better light than coal powered lights, and it is free. Year round solar harvests are possible with light deprivation
Organic soil is available everywhere.
The local nursery has better prices than the grow store.
60 Days of flowering is perfect.
A very in depth look at Harlequin is available HERE.
"CBD peaks at 7 weeks flowering, (up to 14-15%) while in a 2:1 ratio with THC (up to 7%). At 10 weeks CBD remains the same as week 7 but THC catches up to CBD with about a 1:1 ratio."