[Plant-education] (no subject)

Cote, Gary G via plant-ed%40net.bio.net (by gcote from RADFORD.EDU)
Mon Aug 27 17:19:26 EST 2007

Plant Ed folks,

Has anyone grown Pistia stratiotes (water lettuce) for research or teaching?  If so could you share any tips?  The papers I've found in the literature mostly say they grow it in Peter's Professional Fertilizer 20:20:20 in the greenhouse in plastic tubs.  I've got them in black plastic tubs in 20 L of water containing 0.325 g Peter's 20:20:20 per L.  I tried 0.5 g per L.  I've been using nanopure water to avoid chlorine and other trace contaminants, although I had expected to switch to tap plus Peter's when they were growing OK.  Temperature is 22 by night, 26 by day, colder earlier because I had problems with the growth chamber temperature.  They get 14 hours light and 10 dark.  Water is changed weekly or every other week (because of travel).  They did poorly at first, and several died.  Then I had one week the survivors started looking really good and produced a lot of offshoots.  Then I went away and they got a cold shock when the power failed (4 C, I'm told).  They don't seem to want to recover.  The leaves are rotting, and the "stem" will just collapse in a froth of bubbles.  I've got one or two originals left and a few surviving offsets.  Any suggestions gratefully received.




Gary G. Coté

Department of Biology

Box 6931

Radford University

Radford, VA 24142-6931


(540) 831-5630

(540) 831-5129 fax


gcote from radford.edu



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