On Thu, 1 Jul 2004 14:22:58 +0000 (UTC), "Graham Dixon"
wrote:

Does anyone know what natural waterproofing occurs on Nasturtium leaves?

Many plants produce natural waxes and oils. Nasturtiums (Tropaeolum
proper) coat their leaves with water repellant, tiny wax scales to
prevent excessive transpiration and therefore help the plant through
periods of drought. They also reflect back sunlight to prevent
burning and this is an adaptation adopted by many plants, which live
in very exposed situations - sic. Carnations.

HTH.

Dave Poole
Torquay, Coastal South Devon UK
Winter min -2°C. Summer max 34°C.
Growing season: March - November