Can Plants See? Did you know plants use photoreceptors to detect light? This allows them to grow towards light to maximize photosynthesis. It also helps them know when its time to flower! So, Ammonia Production Encyclopedia MDPI Some of my 42 varieties of crotons in my garden. I love the color these bring to my yard. Hoping to top 55 varieties this year. : r gardening Lupinus polyphyllus (blue lupine): Go Botany Flowering Spanish needle or black jack (Bidens pilosa), Colombia Stock Photo Alamy