Got some nice examples of guttation here. Guttation is the technical term to describe when droplets of water, technically xylem sap, form on the edges of leaves. This phenomenon occurs in the early morning when soil moisture levels are high. It is caused by high root pressure - since the water potential of the roots is less then that of the soil solution, water flows into the roots by means of osmosis. At night, plants close their stomata and transpiration does not occur, as a result water pressure builds up in the plant. The excess water pressure in the plant is released by hydathodes, water secreting pores found at the edges of leaves.
note water droplet on tomato leaf margin, this is not a rain drop!Guttation on a tomato leaf (Aunt Gertie's Gold Heirloom variety)
Guttation on tomato leaf
SunSugar FT hybrid
Zapotec
Aunt Gertie's Gold
Dr. Wyche's Yellow
Azoychka - A very productive yellow/orange Russian heirloom
Boxcar Willie
Oaxacan Jewel (bicolor red and yellow) (WA-HA-CAN)
SuperSweet 100 Hybrid cherry tomato
Green Goliath Broccoli, open-pollinated, non-hybrid seed
Guttation on broccoli leaf
Guttation on broccoli leaf
Guttation on broccoli leaf
Guttation on broccoli leafTomato bins!
Bulgarian Triumph
Flamme (orange saladette tomato heirloom from France)
Tangella (orange saladette tomato heirloom from England)
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