06/02/2026
In part one we talked about what a Brix is, why you want a high one, and why molasses is used to raise it.
Today we’ll look at why molasses can be problematic and whether it even works to raise Brix.
Actually, let’s start there.
Does spraying molasses raise Brix? I don’t know because I can’t find anything (ie. a scientific report and not AI) other than anecdotal evidence that it does. Couple that with Brix being an inexact measure to start with, by artificially raising the Brix by feeding sugar we may be ignoring underlying problems.
Remember how I said it’s not a silver bullet?
What molasses can do is become a food source for the bacteria that will feed your plant. A healthy soil full of good bacteria (and fungi and other beneficial living organisms) will help keep your plant healthy and that may be indicated by a high Brix. Ipso facto spraying molasses can help raise Brix - but it’s not necessarily the molasses raising the Brix. It’s the bacteria.
But spraying molasses has 2 problems:
1. it will feed good and bad bacteria indiscriminately. If your soil is sick or you’ve got something funky on your leaves spraying molasses could make the problem worse.
2. it’s not long lasting. It’s the equivalent of eating a lolly for energy. Feels great, then a slump. Feeds the bacteria, bacteria multiplies, then when the food runs out, the bacteria starves and dies off back to sustainable levels. Give the plant sugar, Brix goes up (maybe), sugar runs out, Brix goes down.
If all you do to fix your problems is spray molasses, then you will need to keep doing it - and frequently. Personally, I want long lasting, low effort, solutions.
What to do instead? Feed the soil a balanced meal. I’ve stretched this metaphor enough, but basically we need an ongoing, slow, food source for our soil to thrive. Compost and other organic matter, and a thriving soil food web, is the key. Feed the soil, not the plant.
But molasses does have a place as a tool in your garden - that’s why I was using it.
Oooh who doesn’t love a cliffhanger?
Find out more next time in Part 3 of the Brix and the Beautiful