DMT plant sources is a favorite topic of mine.

1. Desmanthus Leptolobus: the only proven reliable cold-weather source. I have trout's book on Desmanthus and he claims Leptolobus is the only type that reliably works. The big advantage of this plant is that it is easy to grow outdoors in cold weather and seeds the first year. Seeds moderately easy to find. Although my extractions of Desmanthus Illinoisis were much lower, Leptolobus' rootbark is alleged to yield up to 0.14%.

2. Psychotria Viridis: slow-growing tropical leaf source that definitely requires a continuously high humidity to thrive, although some people have gotten it to grow with twice-daily sprayings. My former plants were raised this way. Know that this plant is vulnerable to several types of insect pests. Permanently killing off some pests without using real poisons can be impossible. The biggest advantage of the this plant is the pure alkaloid profile. When you extract the leaves (I have), you'll get a powder that is 100% DMT. Leaf DMT content up to 0.1%, although my results were lower. I've given up on it.

3. Mimosa Hostilis: everybody's extraction favorite. Needs tropical weather and three years to reach a sustainably yielding size. Excellent alkaloid profile from the rootbark. In the USA, unless you live in southern Florida or southern California, you'll need to grow it indoors. Know that a high percentage of the seeds sold for this plant are NOT Hostilis, but a weaker variation that yields less and produces pink flowers, not the white ones of genuine Hostilis. Which you usually won't see for three years. A long time to waste. Unless you personally know someone in South America, any seeds are highly suspect. I have a dozen seeds that I trust. Rootbark yields at 0.57%, although older plants can yield up to 0.2%. I may grow one indoors for fun, but three years is a long time.

4. Acacia Obtusifolia: moderate growth rate low-humidity plant from Australia. Likes very well drained soil. Doesn't like hardly any phosphorous in the fertilizer. It likes low humidity, so don't spray it. Very resistant to most American pests. An easy to grow tree that is a compromise between all issues. Seeds commercially available. I have one growing in my sunroom. Note that the leaves definitely contain a cyanide compound which is allegedly only vaporized off with an A/B extraction initially using HCl acid. Up to 0.07% DMT in the leaf and 0.4% DMT in the bark. The best indoor source to date IMHO.

5. Acacia Simplicifolia: fast growing tree from islands in the south Pacific ocean east of Australia. Seeds very hard to find. Likes HOT weather and will die below 60 degrees F. Mixed alkaloid profile resulting in extracted powder that is not 100% DMT. A major disadvantage, however the information is from a single source, which I never wholly trust. Waiting to see what my three 36" plants eventually yield.

6. Diplopterys Cabreana: slow growing very fussy hard to grow tropical bush with high leaf concentrations of DMT. Supposedly up to 0.7%, which would make it the most desirable leaf source. Unknown 5-Meo leaf content. A trickle of seeds recently became available. I have a few seeds myself. Needs to be grown and extracted to know the truth.

Alternate sources:
Phalaris Brachystachys grass needs to be extracted find out if the 3% claims are realistic. However it may have too much 5-Meo and fats to make it worthwhile.
Acacia Acuminata is being seriously evaluated right now as an easier to grow source. There are so many Acacia subspecies in Australia that it is a virtual certainty that some of them are fast easy to grow sources that just haven't yet been extracted.

I wish I could but you're not allowed to post suppliers or links etc on here. I got a moderator edit just for posting a link to guayusa tea lol.