Can't tell you to use it or not, I'm a total noob to growing pot. Everything I've read here says blackstrap is the shizznit, but the other types are ok to use, as long as it's UNSULPHERED. Blackstrap has more nutrients in it, whether it's good for plants or not I can't say. I'm gonna try it...my 1st grow is an experiment anyway.
From wikipedia:
http://en.wikipedia.org/wiki/Molasses#Cane_molasses
"Sulphured molasses is made from young
sugar cane.
Sulphur dioxide, which acts as a preservative, is added during the sugar extraction process. Unsulphured molasses is made from mature sugar cane, which does not require treatment with sulphur. There are three grades of molasses: mild or barbados, also known as
first molasses; dark, or
second molasses; and blackstrap.
These grades may be sulphured or unsulphured.
To make molasses, the sugar cane plant is harvested and stripped of its leaves. Its juice is extracted from the canes, usually by crushing or mashing; it can also be removed by cutting. The juice is boiled to concentrate it, which promotes the crystallization of the
sugar. The result of this first boiling and removal of the sugar crystals is
first molasses, which has the highest sugar content because comparatively little sugar has been extracted from the source.
Second molasses is created from a second boiling and sugar extraction, and has a slight bitter tinge to its taste.
The third boiling of the sugar syrup makes
blackstrap molasses. The majority of sucrose from the original juice has been crystallized, but blackstrap molasses is still mostly sugar by calories. However, unlike refined sugars, it contains significant amounts of
vitamins and
minerals. Blackstrap molasses is a source of
calcium,
magnesium,
potassium, and
iron; one tablespoon provides up to 20% of the daily value of each of those nutrients. Blackstrap, often sold as a health supplement, is also used in the manufacture of
cattle feed and for other industrial uses.
- Molasses can also be added to the soil of almost any plant to promote microbial activity.
- Blackstrap molasses is often used in horticulture as a flower blooming and fruiting enhancer, particularly in organic hydroponics."