LED lights We first investigated the effects of different LED lights on the vegetative growth of strawberry plants, and consequently, we found that red LED light as well as the combination of red and blue LED light was effective in the production of leaf petioles comparedwith blue LED light (Fig. 4A). Typically, when comparing the two cultivation locations, the petiole formation was demonstrated tobe much greater during growth in the PG than in the GC (Fig. 4A).On the contrary, the petiole length and the growth of leaflets were