Plug-in, portable Tower Gardens teach healthful eating, math, biology
COTTAGE GROVE, Minn. -- Shiann Timmons held up a ruler to her lettuce plant — and her jaw dropped.
“This is amazing!” she said. “It’s 5 1/2 inches! It was half a centimeter in March, and now it’s in these huge bushes!”
Shiann, 11, has become an ardent...