Mystery Sativa

Ssssssssh

New Member
Newbie here, greetings all. As a first time grower, I’m a little ignorant as to protocol on this forum, so I just posted this question in case anyone wiser than me (wouldn’t be difficult) can answer my question. I bought 5x feminised Northern Lights seeds from Nirvana, and it was packaged with 10 freebie regular mystery seeds. Through my own ignorance I lost a few NL seeds attempting to germinate, but I managed to get 1 going. I also planted a few of the mystery seeds and again, I ended up with one female. It’s clearly a sativa, as the pictures show.

Both plants started into flower around the same height - less than one foot tall. It’s now day 37 of flower. The NL is coming on strong about 3-4 weeks from harvest, give or take, according to conventional wisdom (especially the bit about not harvesting early).

The sativa on the other hand has stretched magnificently. Worrying though, it won’t stop! It’s still growing around 2 inches a day I’d guess. Buds are developing, slowly but surely, however they’re nowhere near as mature as the NL, which stopped growing and started fattening after 2 weeks of flower.

My question is, will the sativa stop growing soon? And, if the NL is recommended to be a 7-9 week flower, what do you reckon is the flower time on my mystery sativa? A ball park figure would be great. And bonus points to anyone who can tell me what Sativa strain I might be growing?

Thanks kindly :)

Specs (in case its helpful)
6x3x3 ft tent
400 Watt HPS
Temperature 20-24c
Humidity 40-60%
Temperature Controlled Extraction Fan / Passive Intact (ratio 1:2) Oscillating tower fan inside.
Soilless Mix (Canna Terra Professional Plus)
Nutrients: Canna Flores, Boost, Calmag, Silicon. And PK 13/14 this week with the NL.
I use half the bottle recommendations of everything.
PH feeds for around 6, but I noticed my NL run-off jumps up or down a PH.
Flushed once a mont. More frequently for the NL, due to the PH fluctuations.
Vegged for 7 Weeks. Currently Day 37 of flower.
Pruning, topping and LST throughout veg on both plants, partial mainlining and occasional supercroping on on the Sativa.

Pics 2-4 Northern Lights; Pics 5-8 Mystery Sativa
 

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