How to Malt Homegrown Grain

Homegrown Grains, alcohol, bread, sugar

Malt is a grain that has been sprouted for a short period and halted in order to optimize its enzymic potential to convert starches into fermentable sugars. It can be a useful ingredient to have around for making sweet malt syrup, for baking, and for fermenting into alcohol.

This works on any grain, whether it be corn, millet, einkorn, wheat or other. Each grain differs in respect to its diastatic power, which is a measure of its potential enzymic activity.


Soak grains in enough water to cover for about 10 hours.

Strain and put in a warmish place. We’re shooting for around 70-75 degrees. Rinse by covering with water and straining every 8 or so hours, stopping once some germination begins to show.

For optimal diastatic power we’re letting the sprouts develop until the acrospire is about the same length as the seed kernel. The acrospire is the little shoot that is the new plant as opposed to the rootlets. It grows in the opposite direction of the rootlets. If the kernel is allowed to continue growing it will eventually use the nutrients itself to assist its own growing and our diastatic power will be compromised.

Some “mixing” or turning with your hands may be helpful as the rootlets leg out in order to encourage uniform growth. In big malting operations they will rake them.

When the kernels are ready to halt their growing process dry them for 8-10 hours at 120 degrees. This produces a “green” malt. At this point the rootlets should flake off easily. It’s thought by some that they contribute bitter notes and are separated and removed before proceeding.
If additional flavor is desired move the malts to an oven at 170- 180 degrees and roast until the color and aroma suits you. Raising temperatures above 165 degrees destroys the enzymes however, not allowing the malts to contribute to any adjunct starches. This non-diastatic malt can be used to contribute sweetness, flavor, and possibly color to your bread, beer, or whatever recipes.

Diastatic malt (not dried or roasted above 165 degrees) can be combined with additional starches to make sugar through a mashing process that involves holding the crushed grain and adjunct at 150 degrees for 1-2 hours. Learn more about this and how to make a malt syrup here.

If milling and using for bread baking it is recommended to use nondiastatic malt, or use diastatic malt in small quantities (0.5 – 2% total flour weight) and only for breads with short fermentation times. Diastatic malt is a great energy source for yeasts however it can break down too many starches resulting in a gummy crumb.

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