Hello. I’m looking for plant that grows locally in cold climate to extract DMT. I’m aware of three abundant plants in my country such as phalaris aquatica, arundinacea and phragmites australis. I couldn’t find actual alkaloid percentages in p. arundinacea nor phragmites australis but there are reports of DMT being persent. If percentages are not listed it means alkaloid levels negligible?

Did you check the wiki?

https://wiki.dmt-nexus.me/Phalaris_aquatica
https://wiki.dmt-nexus.me/Phalaris_arundinacea

For phragmites I am not sure, but it might be the same.

No percentages of alkaloids in arudinacea in link provided too only p. aquatica has percentages listed.
I read that alkaloid profile can vary depending on conditions. So which conditions increase DMT amount?

From the wiki page about arundinacea:

Leaves contain DMT, 5-MeO-DMT, and related compounds (Smith 1977) 0.0004-0.121% Total Alkaloids (Dried) Lycaeum (DMT, Life and the Universe)

I would suggest that you work through this thread: https://www.dmt-nexus.me/forum/default.aspx?g=posts&t=16810

More info can also be found in this paper: https://wiki.dmt-nexus.me/w/images/8/8a/Festiandsamorini.pdf

So p. aquatica is much better source of DMT through reported levels are small 0.1%. Are there any conditions that can increase DMT levels in phalaris grass? Only leaves contain DMT and is content of DMT calculated in dry of fresh leaves?
In Festi and Samorini paper I found that stressing phalaris plants can help produce more DMT or 5-MeO-DMT:

"Plants growing after a moisture stress may contain up to three times the concentration ofalkaloids found in regularly watered samples. The highest increase of the tryptamine alkaloids is shown at the first reduction of the leaves turgor: the most affected alkaloid seems to be the 5-MeO-DMT. Moreover, the first regrowth of the stressed plants contains more DMT and less 5-MeO-DMTthan the regrowth of the non-stressed ones [Marten, 1981; Williams, 1972; cf. Ball& Hoveland,1978]. The influence of frost is very similar, even though in this case the DMT appears to be the most affected indole alkaloid. The highest increase for an exposure to -2°C during the night, isfound in seedling of P. aquatica growing at high nitrogen level in the soil and with day/night temperature of respectively 21 and 16 °C [Williams, 1972]. There is, in conclusion, a little increaseof the alkaloids in plants growing at high compared to low temperature but in general the effects ofthis factor are weak [Frelich, 1973; Frelich & Marten, 1972; Marten, 1981; Marten& Frelicr1977; Moore etal, 1966; 1967;

So lack of water, high nitrogen soil and frost seem to increase DMT.

Also, check this , and the quote in the first post regarding harvesting time and change in alkaloid content