Why does a tree grow at different rates each year?

What flowers start with H? Are dead pine needles good fire tinder? How old is the old gum tree at Glenelg? How can I successfully grow a Calathea plant in water? How can a French drain be effectively incorporated into a retaining wall design to manage water drainage and prevent erosion? A slender growth supporting a flower or plant? Black Beans? Do hydrangeas attract bees? Can an Aerogarden grow Iris flowers? Why do seeds need to be dried before planting? What is the Malayalam name of redwood tree? Genetic engineers are transplanting genes from one crop plant to another to create crop plants that are resistant to insects true or false? Since Peonies are so top heavy should the flowers be cut and does cutting peonies encourage more growth? What would we do if we found bad plants spoiling our lawn? How can I tell if a bloomed artichoke is still safe to eat? Do poinsettias have a smell? Is palm tree fruit edible? How can I fix an overwatered fiddle leaf fig plant? How long can potatoes stay in the ground after frost before they are at risk of damage or spoilage? What type of forestry includes the planting of young trees after mature trees have been harvested?