Bulbs Forcing Houseplants

Drunken Amaryllis Are Shorter

By Larry Hodgson

Question: Every year I buy an amaryllis bulb for Christmas and put it in a vase of water to make it bloom. I follow a tip from style guru Martha Stewart who recommends putting a little rubbing alcohol in the water to shorten the bulb’s flower stem so it won’t fall over. But when should it be applied?

Michel Lapointe

Answer: Actually, Martha Stewart didn’t originate this tip, but just shared one she found elsewhere. 

The actual technique was developed by Cornell University’s Flower Bulb Research Center, apparently following an incident that occurred at their 2002 Christmas party. A drunken student is said to have poured vodka into a vase containing Paperwhite narcissus bulbs that were being forced in water and they grew only about half as high as normal, yet produced perfectly healthy, full-size flowers. Scientists being scientists, they tested this further with other bulbs and various alcohols and found you could indeed reduce stem length of bulbs being grown in water by careful use of alcohol. 

Why this occurs is uncertain, but one theory is that, since alcohol is poisonous to plants (as it is to humans and other animals), applying a small amount of alcohol, enough to slightly poison the plant without killing it, may reduce its growth.

Amaryllis bulb in a transparent vase.
Apply alcohol when fresh roots begin to show. Photo: fluwell.com

Apply the alcohol as soon as new roots begin to form under the amaryllis (Hippeastrum) bulb, emptying the vase of its water and adding the alcohol/water blend instead. The recommended dose is 1 part 70% isopropyl alcohol (rubbing alcohol) to 13 parts water. If you prefer to use vodka, whiskey or another distilled alcohol, the dose would be 1 part alcohol to 7 parts water. Avoid beer, wine, and other sugary drinks. 

You can also use this same technique for any bulb you force in water, such as hyacinths and Paperwhite narcissus.

Do note, though, that bulbs forced in water or in stones set in water (with or without alcohol) are hard to recuperate. Normally, you would simply toss them into the compost after they finish flowering. If you want to save the bulb for future blooms, grow it instead in a pot using potting soil. 

Garden writer and blogger, author of 65 gardening books, lecturer and communicator, the Laidback Gardener, Larry Hodgson, passed away in October 2022. Known for his great generosity, his thoroughness and his sense of humor, he reached several generations of amateur and professional gardeners over his 40-year career. Thanks to his son, Mathieu Hodgson, and a team of contributors, laidbackgardener.blog will continue its mission of demystifying gardening and making it more accessible to all.

2 comments on “Drunken Amaryllis Are Shorter

  1. This is weird. I just read about it for the first time about two days ago. I will probably never use the technique though, since I prefer to plant the bulbs out afterward, even though I know that few recover from forcing, even without alcohol.

  2. Instead of poisoning the bulb why not just choose a shorter cultivar or use some decorative support twigs to hold the stem up. Amaryllis can live a very long time so it seems sacrilegious to treat them as annuals

Leave a Reply

Sign up for the Laidback Gardener blog and receive articles in your inbox every morning!