HELP! Autoflower flowering very slow

[Afroman1]

Hi guys I've had these Dutch passion Auto Mazar's on the go for 10 weeks now and they are very very slow in the flowering stage. They have plenty of bud sites however the buds that are there just aren't growing, it's as if she's flowered and just doesn't want them to fill out or get bigger. Has anybody experienced this before? They are under 300W led light. In soil. Getting ionic bloom nutes at the recommended strength. No signs of illness on the plants, temp stable between 25/30degrees. Lights on 20 & 4. The picture attached is from today however the bud sizes hasn't changed for around 2-3 weeks now. Any ideas?!

[Potted]

What size pot or sp are u growing in?

[DoctorJohnson]

What size pot or sp are u growing in?

And what is in the pot (soil)?
And what are you fertilizing?
And what I'm most curious about, what light are you using? (Label watts and actual watts)


That's a nice look plant even if it is growing slowly.

[Afroman1]

Hi Guys they are in 20L pots. Biobiz Light Mix Soil. Feeding Ionic Bloom @ 7ml per Ltr. 300w Viparspectra LED over 2 plants. Both are very tall around 1.2m! No sign of poor health just incredibly slow bud growth. Maybe slight yellowing to one leaf on one of the plants but think that's just a cal/mag thing, easily fixed. Just not sure why bloom growth has just kinda halted?

[Insight]

FYI......300 watt Viparspectra is 135 Actual watts

[DoctorJohnson]

> FYI......300 watt Viparspectra is 135 Actual watts
And that's not much, which is why I was curious about the light. The plant looks kinda stretchy--but OK, and it's gonna produce even though not a lot, so patience, and next time about 200 actual watts per plant as a rough number.

[abadtrip]

1 of them vipa 300 will work for 1 plant i have has amazing results with them I have 3 in a 2 x 4 and got 13 oz from a 9 week grow get another 1 and give each plant a light also don't turn ya light off u have 4 hrs of what sleeping autos don't need to sleep

[Afroman1]

Thanks for the advice on the lighting guys, still pretty slow bud growth and it feels like they have been flowering forever. Probably is to do with the inadequate lighting. What do you think about me throwing in a cheap red spectrum CFL to supliment the LED? Think maybe throwing in a 200w red CFL will help?

[Weed Pharma]

The penetration of most lights (LED) is between 12"-18". Anything below that line -will likely not develop as you would like.
Consider topping next time - https://forum.growweedeasy.com/forum...ies-autoflower

Autos can take much longer when there is less light. ie window sill grow took additional 6 weeks to mature- so be patient.

Too much N will also contribute- you mention recommeded dose of nutrients?
Most manufacturers recommendations are for photo plants under 1000w mh-hps, etc in 5 gallon containers under controlled temp/humidity etc.

For autos, you decrease the dose by 1/2 and then reduce that amount for LED lights by 20%.
Cal/Mag is important throughout the grow for LED's- MarsHydro has been including info with LED's for a couple of years now.

Don't bother with supplimental lights.

I have grown many auto mazar's and they pack on crazy bulk at the very end- but I have never had one stretch that tall, which is hindering this plant.