ZINNIAS:
Give them the "wiggle" test.
Select a zinnia stem that is mature, and has a stiff neck. Mature zinnias show at least some of a gold ring around the center. Gently rustle the stem at the "neck" below the flower head. If it is firm, this will be a good flower. Don't pick zinnias that still have tender stems, they will break easily.

COSMOS, MARIGOLDS, other small flowers:
Select mature flowers here also, ones with sturdy necks. If the neck of the stem is not stiff when you cut it, it will Not get better. Pick quality flowers.
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Keep the water in your vase very clean!
​Add a drop of bleach to the vase water.

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SUNFLOWERS

Don't only pick the oldest blooms. Younger blooms will last longer. Science Lesson: stare at them until you can see the difference.

Keep the water in the vase very clean, and trim the stems every few days. Add a drop of bleach.
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SUNFLOWER FACTS

Cold temps can slow their maturity and blooming.
Excessive rain can stunt their growth.
Climate factors affect their height.
​Sunflowers like it hot!!
So do Zinnias!