Lemon Thai x Chem D Sativa-Leaning Hybrid Breeder: Top Dog Seed Co. Lemon Thai x Chem D is perfect for Deadheads and all music lovers. Chem D is a strain spanning back to the 1970s and was frequently consumed at Grateful Dead Concerts of the time. Combining with the zest of Lemon Thai, this strain has that noticeable Chem funk taste with a sweet, savory spice---perfect for a daytime smoke.