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Seeds all germinate, but don't sprout when planted?
- Thread starter FrankC
- Start date
Cougar672
New member
Just re-read your post. If I understand correctly, you mixed nutes in the water that you then gave to the seedling? If that is the case then I suspect the nutes killed your seedlings. I don't give any nutes until the second set of true leaves is growing, and then at only 1/4-1/2 strength.
I started another grow with 4 seeds of the same 4 strains, all autos. This time, I made several changes:
1) I avoided cooking the seeds on the heat mat (last time the temp got up to 90 degrees at one point).
2) I waited until the taproot was about 1/2 inch long before planting them.
3) I planted the sprouted seeds in Coco coir/perlite in Solo cups rather than in Jiffy plugs.
4) I adjusted the pH of the water to about 6-6.5. (I also added a VERYT TINY dose of nutes and cal-mag, as Bluey suggested).
Success! (so far). Three of the seeds had a taproot long enough to proceed after 2 days (under wet paper towel in Ziploc bag). The fourth (Northern Lights) had no tap root after 4 days, so I sadly discarded it.
And after 2 days in Coco-coir, all three of the planted seeds have sprouted!
This is Tanya (Tangerine), the first to sprout:
This is Blanca (White Widow):
And the baby of the family is Betty (Bruce Banner)
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1) I avoided cooking the seeds on the heat mat (last time the temp got up to 90 degrees at one point).
2) I waited until the taproot was about 1/2 inch long before planting them.
3) I planted the sprouted seeds in Coco coir/perlite in Solo cups rather than in Jiffy plugs.
4) I adjusted the pH of the water to about 6-6.5. (I also added a VERYT TINY dose of nutes and cal-mag, as Bluey suggested).
Success! (so far). Three of the seeds had a taproot long enough to proceed after 2 days (under wet paper towel in Ziploc bag). The fourth (Northern Lights) had no tap root after 4 days, so I sadly discarded it.
And after 2 days in Coco-coir, all three of the planted seeds have sprouted!
This is Tanya (Tangerine), the first to sprout:
This is Blanca (White Widow):
And the baby of the family is Betty (Bruce Banner)
Last edited:
Gingerbeard
New member
AAhhhhh... it is so nice to identify and solve a problem.
Watering question (for new seedlings, one day after they emerged):
I am growing in Coco Coir/Perlite in 9 oz Solo cups.
I am using an AC Infinity seedling tray/humidity dome, and their brochure “Intro to growing hemp†says “Do not water the seedlings unless the bottom of tray, nursery bag or fabric pot feels dryâ€
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But the article https://www.growweedeasy.com/coco-coir says (re seedlings): "When watering, keep giving water until about 10-30% extra runs out the bottom. Then don’t water again until the top inch or so starts feeling dry to the touch.
If I wait until the bottom is dry, then the Coco coir above will be very dry.
Any suggestions which to follow?
I am growing in Coco Coir/Perlite in 9 oz Solo cups.
I am using an AC Infinity seedling tray/humidity dome, and their brochure “Intro to growing hemp†says “Do not water the seedlings unless the bottom of tray, nursery bag or fabric pot feels dryâ€
​
But the article https://www.growweedeasy.com/coco-coir says (re seedlings): "When watering, keep giving water until about 10-30% extra runs out the bottom. Then don’t water again until the top inch or so starts feeling dry to the touch.
If I wait until the bottom is dry, then the Coco coir above will be very dry.
Any suggestions which to follow?
Gingerbeard
New member
Seedlings can stay wet longer than plants. Figure one way of getting things going is to towel sprout. They stay wet until put in soil.
Your seedlings are still young enough you can keep the soil wet. Until you have your first serrated leaves, you cannot give seedlings too much water.
Domes are only necessary if you are unable to keep at your seedlings to make sure they do not dry out. I never had a Solo go dry in a day.
Your seedlings are still young enough you can keep the soil wet. Until you have your first serrated leaves, you cannot give seedlings too much water.
Domes are only necessary if you are unable to keep at your seedlings to make sure they do not dry out. I never had a Solo go dry in a day.
Allenpro
New member
I dont flush or prep the coco unless I buy it in a block, and I have not bought it in a block in years. Mother Earth Coco Coir doesnt usually have enough perlite for me so I add a bit. Coco Loco from Fox Farms has some starter nutes in it so I dont usually feed any nutes until I am getting close to flipping to 12/12. If they get hungry they will let you know
Allenpro
New member
Never let coco coir dry out, its hydro, I feed/water 3 or more times a day. That said I think it may be possible to drown a seedling in coco so when I use (vented) solo cups I put them in a tray and add water to the tray. The coco coir is like a wick and will soak it up and I think that lures the roots down to the bottom of the cup. Once I start seeing roots coming out of the drain holes in the cups I water from the top
Next issue: My seedlings look "leggy", I think.
Blanca, Betty and Tanya - left to right
Tanya, on the right, has already had about 1/2 inch of coco added to help support her. Her stem is 1 1/2 inches tall (and it would be 2" if I hadn't added soil)
I read that too little light is one possible cause.
I have these seedlings in an AC Infinity propagation system with humidity dome with attached LED lights. Their brochure says to have the lights set on setting "1" for seedlings, with the lights a maximum of 1 inch from the canopy. But because I am using Jiffy Cups, I am using an extension that raises the dome and the lights by 4 inches, so the lights were about 5" from the canopy. Therefore, I turned up the lights to setting 5 since yesterday.
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I read that other possible causes include being too dry - but I don't think that is the explanation, I have been keeping them pretty moist.
Any thoughts?
Thanks.
​​​
Blanca, Betty and Tanya - left to right
Tanya, on the right, has already had about 1/2 inch of coco added to help support her. Her stem is 1 1/2 inches tall (and it would be 2" if I hadn't added soil)
I read that too little light is one possible cause.
I have these seedlings in an AC Infinity propagation system with humidity dome with attached LED lights. Their brochure says to have the lights set on setting "1" for seedlings, with the lights a maximum of 1 inch from the canopy. But because I am using Jiffy Cups, I am using an extension that raises the dome and the lights by 4 inches, so the lights were about 5" from the canopy. Therefore, I turned up the lights to setting 5 since yesterday.
I read that other possible causes include being too dry - but I don't think that is the explanation, I have been keeping them pretty moist.
Any thoughts?
Thanks.
​​​
Today, 4 little droplets of something appeared on the leaves of the tallest seedling, Tanya. I did not splash water on in when I watered it about 1-2 hrs ago, so I think they are secretions from the leaves. The humidity in the dome is about 65-70%.
Any ideas what these are?
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Any ideas what these are?