If the leaf turns blue-black what conclusion can we make?

Where do seeds get their energy to germinate? What is a wild plant with yellow or white flowers? What does a prune tree look like? What is NJ number one production crop? How much do lilies weigh? How can I effectively prevent my garden from being overrun by spike weeds? How do you tell when stripe less watermelons are ripe? Is an oak tree from the tundra biome? What kind of trees gives us shelter? What type of coastal tree grows in the valley of the coast range mountains? What does over watering your garden encourage? How often should I water my spider plant in the winter to ensure its health and well-being? What is a Rorschach test in flowers for algernon? What can zebras interbreed with? Where do you find sunflowers on mysims? Where do jackfruit grow? What do sea hibiscus eat? Why do leaves of a house plant often face the window? Your sunflowers are tall and now they are gorwing over and down why? What is white when dirty?