Jamaican Pearl & Northern lights

19/09 Day 15 I am planning to train them this friday with the mainline technique. And switch the light to 12/12 next monday. 22/09 Day 18 I tossed 1 of the Jamaican Pearl plants because it was staying very small and could not keep up with the others. I do not want to waste time and growing space for slow growers. I might train this Jamaican pearl 2 times with the mainlining technique and the Nothern Lights only 1 time. Because the Jamaican pearl is a pure sativa strain. And the Nothern Lights are a pure indica strain. So to keep them growing at the same height this could be the perfect way to train them.