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Why do leaves change color in autumn?

10/21/2015

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The vibrant greens of summer have given way to the rich colors of autumn--browns, reds, oranges, and golds. The keys to changing leaf colors are long cool nights and short sunny days.  
Leaves are nature's food factory but as the autumn sunlight decreases and nights become cooler, leaves stop producing food for the tree. The tree will rest and live off the food it stored during the summer. This causes a leaf's chlorophyll (the pigment that give leaves their green color) to break down. The green chlorophyll will disappear from the leaf and its yellow and orange colors will become more prominent. 

The red and purple colors (maple trees) occur when glucose (sugar used for energy and growth) is trapped in the leaf's sap cells after food production stops.

The brown color of oak leaves is created from waste left in the leaves at the end of the summer season.

Once a leaf has changed color, the tree begins the process of shedding it by releasing more of the plant hormone ethylene. This allows cells at the base of the leaf stem to pull apart and fall to the ground.

Stems, twigs, and buds can survive in extreme cold but leaf tissue is too tender and would freeze during the cold months. The trees must toughen up and protect their leaves (evergreens) or dispose of them (maples, oaks, elms, etc...) to ensure the tree's continued survival.








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Monday Memo

10/12/2015

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SKI TIPS for October

10/1/2015

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  • Sparrows migrate in flocks during the fall to spend the winter in the most southern states. Look for them under your seeders during the fall and early winter.
  • Keep plants, especially newly planted stock, well watered until the ground freezes.
  • Plant new spring and summer flowering perennials so their roots will have time to establish during winter. Perennials planted in fall perform better than those planted in spring.
  • Continue to mow your lawn until the first frost. This will help keep your lawn strong and healthy through the winter.
  • Dab olive oil on a paper towel and wipe over leaves to make plants shine.
  • Houseplants, especially those that spend the summer outdoors, may drop leaves in response to lower light.
  • Each king in a deck of playing cards represents a great king from history: Spades, King David; Hearts, Charlemagne; Clubs, Alexander the Great; Diamonds, Julius Caesar.
  • The only food that doesn't spoil is honey.
  • Do NOT feed your dog or cat grapes and raisins. Scientists aren't sure why, but eating these fruits can cause canine and feline kidney failure.
  • It takes 30 to 60 minutes for the average spider to make a round web. Some species make new webs every night, while others repair their webs as needed.
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