Vitamin B1 for Plants

Home » Blog » Vitamin B1 for Plants

Robert Pavlis

Vitamin B1 is that miracle drug that makes all plants grow bigger especially after transplanting. It is added to several different kinds of fertilizer and plant additives. Guess what – it doesn’t work.

vitamin b1 for plants
Vitamin b1 for plants

Photo Source: Farmer Fred Rant

The history of this myth is quite interesting and told in detail here. In 1930 a scientist noticed that vitamin B1 stimulated root growth in a petri dish in the lab. A few more tests and people started becoming convinced that it was the greatest thing since sliced bread. In 1939 Better Homes and Gardens published a report that showed vitamin B1 resulted in huge rose flowers and giant daffodils among others. The myth was launched and fed on itself; after all if Better Homes and Gardens says it is true – by golly it is true!

By 1942 even the original author of the study admitted that vitamin B1 had no positive effect on plant growth and said “It is now certain, however, that additions of vitamin B1 to intact growing plants have no significant or useful place in horticultural or agricultural practice” But it was too late. The public knew it worked, and manufacturers were selling it like hot cakes.

Products still contain it today even though the science community has known it does not work for over 70 years.

Microbe Science for Gardeners Book, by Robert Pavlis

Don’t be duped.

If you like this post, please share .......

Robert Pavlis

I have been gardening my whole life and have a science background. Besides writing and speaking about gardening, I own and operate a 6 acre private garden called Aspen Grove Gardens which now has over 3,000 perennials, grasses, shrubs and trees. Yes--I am a plantaholic!

49 thoughts on “Vitamin B1 for Plants”

  1. My friend at the agricultural university has done research on orchid growing media, with and without the addition of thiamin. And the result is that there are differences in stem height and leaf width, although not in the number of leaves.

    Here is a PDF file of his research, in Indonesian language :

  2. No one uses vitamin b as a fertilizer…. vitamin b works with plants to cause a systemic immune response, which helps boost the plants naturally immunity to disease for up to a week. The only scince in this post is a revision from 1942…. just keep that in mind


Please leave a comment either here or in our Facebook Group: Garden Fundamentals