Autumn brings a different sort of “bloom” to the garden. Cooler temperatures break down chlorophyll in leaves to reveal pigments that have been in the leaves all along, but have been masked by the green shades of chlorophyll. These now-exposed yellow, red and orange pigments give us the wonderful fall colors in some of our deciduous trees. One of the best examples of this at the Arboretum is “Green Cascade” Fullmoon maple (Acer japonicum) which lights up our cloudy, gray days with a riot of red, yellow and orange foliage.
• “What’s in Bloom” is a regular feature that runs during the year’s warmer months and features blooming plants at the city-owned Jensen-Olson Arboretum.