This past Sunday, we were enjoying a quiet family breakfast, when all of a sudden we heard two chainsaws rev up. Now it was almost nine o’clock, but seriously – it was SUNDAY morning!
Apparently our neighbour was having a tree removed. I didn’t think arborists worked on Sunday, but obviously these guys do. Aside from being slightly annoyed at our tranquil morning begin interrupted, I couldn’t help but admire the grace and agility of the arborist clamouring up the tree. The tree is question was a Tree of Heaven (Ailanthus altissima). It hadn’t been in good shape – several main branches were dying and it had barely sprouted any leaves this spring. From the time the two man crew started, it took them two hours to cut the tree down. One man was in the tree cutting the branches off it sections, and the other was on the ground, cutting up the branches into smaller pieces.
I had to take an arboriculture class in school and we did several field trips where we had to climb (or attempt) a tree using all the gear. Let me tell you – it’s TOUGH! I really admire how easy they make it look. Not only do they have to make sure they’ve got a safe roosting spot in the tree, but they also have to wield a chainsaw and direct the falling branches to a safe location below. I’m impressed …. even if it was Sunday morning!
If you haven’t been outside lately, you’re missing the fabulous fall foliage. As the days get shorter and the temperature drops, trees sense the approach of winter. During the fall, the green canopy of summer transforms into a colourful smorgasbord of reds, oranges, and yellows. Have you ever wondered what triggers the leaves to change colour?
During my horticultural studies, my ornamental plant professor explained it best. Leaves change colour because of a chemical shift in the foliage. During the summer, leaves produce chlorophyll, which is used to absorb sunlight, which is then turned into glucose – in other words, photosynthesis. As the tree prepares to hibernate chlorophyll production slows down and the glucose and nutrients from the leaves are absorbed by the branches, trunk, and roots. Since chlorophyll makes the leaves green, the remaining pigments in the leaves take over. Yellow and orange leaves contain carotene (the same pigments that give carrots their bright orange colour). Red and purple leaves contain anthrocyanins (which give radishes and red roses their vibrant red colour).
Pretty technical, I know, but it does shed some light on the chemical shift that the leaves are experiencing. Of course, there are other factors that influence how vibrant the colours become including temperature and soil moisture. In southern Ontario, our fall colours seem to pop after we enjoy several consecutive warm, sunny days and cool nights. I can’t imagine living somewhere in the world where they don’t experience changing seasons. As we transition into each new season, the garden is filled with new splendors to explore!