Have been nursing plants with a slow start (from seeds, long stems, 3 weeks in). Upped the nutrient feed yesterday, but still at 1/3 to 1/2 strength. Discovered leaves curling at tips this AM. Am I feeding too much too soon? Trying to be very careful not to overwater or overfeed!
thanks!

sounds like too much feed if you noticed it the morning after increasing it

long stems are usually caused by not enough light

Thanks. Should I try and flush with such young plants (the rockwool is still a bit damp) or wait a day or two and just give 'em water?

if all you've got is leaf curl and you havn't fed them more than 1/2 strength feed already, then it should be ok if you just reduce the feed to 1/4 strength (or even less)

just keep an eye on them, sounds like you're doing that already, you'll be ok

keep coming here and you should have no trouble

what light have you got them under? what size rockwool have you got them in?

Is there a schedule here for rockwool seedlings and nutes, please?

They're in a cabinet with a 400w MH and in 3" rockwool cubes. I started them in 1" cubes, then inserted them into the 3".
I was told to alternate between feeding and water alone until they're further along. thanks for the help!

Now the same plant's leaves are yellowing and looking a bit mottled. Please take a look at the photo!Click to view attachment

looks like you could do with using just plain water for a day or two see how they perk up,

i can't open the picture, but from what i can see in the thumbnail it looks more like you may of started feeding too soon

what size cabinet w x d x h have you got?

hows your ventilation? what fans have you got?

have you taken the wrapping off the cube?

what size cabinet w x d x h have you got?

2 1/2' by 2 1/2' by 3' (the bulb is 32" above the plants)

hows your ventilation? what fans have you got?

Got a small fan blowing - it's built-into cab (bought from BCNORTHERNLIGHTS in Vancouver)

have you taken the wrapping off the cube?

Yes.

if its purpose built, great, how about the temperature? have you measured it?

you say you've got a 400w MH. Did that come with the cabinet? If so, sounds like a veg cabinet


you don't need to do that, can you put a cover on pot so light doesn't shine down the sides?

where are you going from here?

are you growing in nft?

if its purpose built, great, how about the temperature? have you measured it?

No, but I'll do that right now.

you say you've got a 400w MH. Did that come with the cabinet? If so, sounds like a veg cabinet

yes, lamp comes with the cab which is sold as 'all-purpose'. I've already done one crop from cuttings using
this cab and it went pretty well. This is my first attempt with seeds.


you don't need to do that, can you put a cover on pot so light doesn't shine down the sides?

I'll cut some plastic from garbage bags and cover.

where are you going from here?

Going? Not sure I understand question?

are you growing in nft?

don't know what nft is. The cab is designed to grow in Rockwool with a circulating hydro system. You can see
cab here: www.bcnorthernlights.com I have the 'Mothership' model.

hmm, they got some nice bits on there, i like the dryer

i've just got this from their site -

The Mothership is a vegetation station. Holds the power cloner and 2 mother plants perfectly. Can feed 1 - 4 Producers, giving you a scalable factory. No downtime = quicker crops.

so you're trying to flower with something designed to veg

the unit is 46" high, once you take off the space the bulb takes, the space the roots take, the space you need above the plant and under the light (a foot at least) its gonna be pretty tight in there flowering

i'll be honest, i've never flowered under a Metal Halide light and i'm not one who mixes one in with the HPS either, so i wouldn't like to comment on the light, only to say that metal halides have more of a blue hue to them compared to the sodium's red hue. This unit WILL take a 400w sodium in the same ballast

as cannabis is an annual plant, red in the spectrum helps it flower as in autumn you generally get more red in the light naturally

its got nothing to do with whats going on now, but its worth thinking about changing to a sodium, you'll get tighter buds

when i asked where you were going i meant how were you going to grow the plant as you had it in a 3" rockwool cube in a soil/coco pot

'so you're trying to flower with something designed to veg'

They supply an HPS lamp to switch to @ flower.

'the unit is 46" high, once you take off the space the bulb takes, the space the roots take, the space you need above the plant and under the light (a foot at least) its gonna be pretty tight in there flowering.'

It is tight - I had to use chicken wire to get the first crop bent over, but I was stupidly growing a sativa dominant in too tight a space and then I kept them in veg too long. It was nightmarish! But the result was pretty good.

'when i asked where you were going i meant how were you going to grow the plant as you had it in a 3" rockwool cube in a soil/coco pot'

My first crop went all the way in the 3" cubes. Should I have done something different?

I take it the roots should be protected from any light - which is reason not to remove plastic from cubes?
The temp inside is 84F/36C
Thanks for all your comments. Really appreciate it!

thats good that they supply you with the lamp - cool


you need to get that down pronto - think of 31 as a max

i'm still trying to picture how you flowered your last plants

was it a rockwool cube sat in nutrient with an air pump aerating the nutrient

for those that don't know, this is what we're talking about

Click to view attachment

The cubes sit in slotted flower pots which are suspended above reservoir containing nuts and air pump, which the roots are able to grow down into. There's a recirculating pump which feeds plants 2x a day.

containing nutes?

i think i've got you, like a shallow bubbler?

i'm surprised its running at 36 degrees, i would of thought it was designed to run with a lower temperature, could be worth asking?

but flush it through, then low feed