Those
paperwhites and other
daffodils sure could use a
drink! A little whiskey,
vodka gin or tequila could
keep them from falling
over.
A
new Cornell
study finds that a touch
of booze is a great way to
keep certain houseplants
from getting too tall by
stunting their growth.
"Dilute solutions of
alcohol -- though not beer
or wine -- are a simple
and effective way to
reduce stem and leaf
growth," said Dr.
William Miller, professor
of horticulture and
director of the Flower
Bulb Research Program at
Cornell
|
|
| From
left: Untreated
paperwhites grown
in water, plants
grown in 2
percent, 4
percent, 6
percent, 8 percent
and 10 percent
ethanol. |
"When the liquor is properly used, the
paperwhites we tested were stunted by 30 to 50 percent, but their flowers were as large, fragrant and long-lasting as usual," added Miller, whose new study on how alcohol inhibits houseplant growth will be published in the April issue of HortTechnology, a peer-reviewed journal of horticulture.
Miller will be working this spring to see if a little booze works for amaryllis and such vegetables as
tomatoes and
peppers, as well. His work with tulips so far has been promising but not yet definitive: "I think with a little jiggering -- no pun intended -- of the system, the method will work for tulips, though I think it will not be as simple as with
paperwhites."
Last year, Miller received a call from The New York Times about a reader who had written to the garden editor claiming that gin had prevented some paperwhite narcissi from growing too tall and floppy and asked if it was because of some "essential oil" in the gin.
Intrigued that dilute alcohol might act as a growth retardant, Miller and former Cornell student Erin Finan '05 conducted experiments with ethanol (1, 5, 10 and 25 percent) and "Ziva" paperwhite narcissi (Narcissus tazetta), and later with about a dozen kinds of alcohol, including dry gin, unflavored vodka, whiskey, white rum, gold tequila, mint schnapps, red and white wine and pale lager beer, on paperwhites.
"While solutions greater than 10 percent alcohol were toxic, solutions between 4 and 6 percent alcohol stunted the paperwhites effectively," said Miller.
To control stem and leaf
growth, he suggests waiting until paperwhites or other daffodil shoots are several inches long to drain the water and replace it with a solution of 4 to 6 percent alcohol -- hard liquor or rubbing alcohol.
To get a 5 percent solution from 80-proof liquor, which is 40 percent alcohol (such as gin, vodka, whiskey, rum or tequila), add one part liquor to seven parts water. To use rubbing alcohol (isopropyl alcohol), which is 70 percent alcohol, dilute one part with 10-11 parts water.
Why does booze stunt plant growth? "We don't know, but we're working on this," Miller writes in a fact sheet available on the Web called "Pickling Your Paperwhites"
(available at http://www.hort.cornell.edu/miller/pubs.html).
"We think it simply might be water stress, that is, the alcohol makes it more difficult for the plant to absorb water, so the plant suffers a slight lack of water, enough to reduce leaf and stem growth, but not enough to affect flower size or flower longevity."
But don't serve beer or wine to plants -- the sugars wreak havoc on their health.
William B.
Miller
Professor of Horticulture
Director of the Flowerbulb
Research Program
Cornell University
