B, ① Grafting and tissue culture belong to asexual reproduction, ③ Seed reproduction belongs to sexual reproduction, and B is wrong.
C. The reproductive modes of plants include sexual reproduction and asexual reproduction. Therefore, ① ② ③ are all reproduction modes of plants, and C is correct.
D, ① Grafting, ② Tissue culture belongs to asexual reproduction, ③ Seed reproduction belongs to sexual reproduction, and D is correct.
Therefore, choose: B.