Why is the bottom of my 60ft spruce tree losing all its needles?

What is the plural form of grow? What flower parts attract honeybees the most? Is white pine needles simple or compound? Do ferns have flower reperdoction? Meaning of red bows around trees? How can hazelnut shells be effectively used for landscaping purposes? What is the official orgon state flower? Why are my terracotta pots turning white? Where did vegetables come from? How can I split black-eyed Susans to propagate them effectively? 6 ft x 19 ft is how many square yards? What is pantination? Why don't coniferous trees change color? How can I effectively remove dead leaves from my snake plant? How long will it take for a cherry tree to produce fruit if I am starting out by germinating a seed? How can I effectively use plastic sheeting for a cold frame to protect my plants from the cold weather? How can I effectively clean outdoor rocks? Why are my lilies turning brown? What is the name of the place where beekeepers work? Which family of plants is involved in the nitrogen cycle?