This is usually caused by a fungal disease called "damping off". The cause is infected soil, waterlogged substrate, high humidity. any conditions that promote fungus. The fungus attacks the soft tissue in the stem which withers at the base or midway. The seedling collapses and dies. Another possible cause is that the seedlings died from lack of water or a high salt level in the substrate (which basically has the same effect of drying out the plant). Seedlings have only a small amount of roots and few leaves. They cannot retain much water and quickly dry out. High humidity in the grow space does not compensate for a desiccated substrate. Your soil/rockwool has to be moist enough to sustain healthy roots and provide water to the plant. Photo shows “damping off”.
Outdoor frost can kill seedlings overnight. Keep your seedlings indoor until there is no danger of sudden frost. See our GERMINATION GUIDE for great product tips on how to keep your seedlings warm outdoor or in the greenhouse.
b) Dark seeds indicate fungal attack. A whitish substance is visible fungal mycelia. Fungus spreads under cold, wet, & anaerobic conditions. Several combinations of factors can lead to seeds rotting: poor soil quality (infected, bad pH, or high EC), pre-soaking seeds in water, substrate is too wet, substrate is in a cold environment, and/or excessive high humidity caused fungal growth in substrate (due to humidity dome/propagator, pots covered with plastic, poor ventilation).
You can use a humidity dome/mini-greenhouse as a tray for germination but you must keep the lid half-way open or completely seperate to ensure fresh air exchange and humidity levels below 50%.
a) the seeds all look the same like when you planted them (intact, healthy colour).
Our reputation as a reliable seed company is based on constant and strictest quality control by our breeders. From production to packaging we scrutinize the quality of every seed and select by hand. Our selection is so strict that we also dismiss perfectly healthy seeds simply because of a smaller size or unusual shape.
Please take note that customers who soak their Mandala seeds in water or wet paper tissue do so at their own risk. We are not accountable for any failure in germination or complications caused by this method.
You just got new seeds and are looking forward to starting a new grow. After you put your seed in a cup or Jiffy pellet, you watch excitedly as it comes to life; the seed cracks its shell and is now making its way upward towards the light. You watch as the tiny seedling unfolds its first set of tiny leaves. So far, everything is looking great. A few days later, as you check on your new green friend, you find that it has drooped over. Frantically, you try to revive it, maybe by watering some more or administering some of those “special nutrients” – but no dice. Unexpectedly, your seedling has died and you’re stumped. How could this have happened?
Damping-off is a common disease that can affect sprouting seeds, seedlings, or cuttings. It can be caused by several types of fungi, namely Pythium, Botrytis, and Fusarium. Pythium is most common. Although fungus is the main reason for damping-off, the disease is normally the result of several conditional factors.
WHAT IS DAMPING-OFF?
When a seedling has already toppled-over from damping-off, there is nothing you can do to recover it. The best you can do is quickly remove the affected seedling together with its cup to prevent the spread of disease to other seedlings.
Unfortunately, damping-off can happen very quickly. Many times, a seedling can go from looking healthy to dropping dead in just one single day. When this happens, it is already too late to do anything since the fungus has already infected your plant and there is no method of recovery. However, you can learn to spot the signs of damping-off in order to prevent it from happening again.
Each of these factors by itself or in combination increases the risk for damping-off. Once the conditions for the fungus to grow are optimal, the disease will normally attack your plants at the bottom of the stem, just above the soil line. The fungus will weaken the stem, cut-off the fluid circulation of your seedling, and ultimately kill it.
GENTLY cover it with a couple of cm of soil (and water). COver with small humidity dome. The root should NOT be exposed to the light. If it has not sprouted within 3 days of this I’d pronounce life extinct.
Not sure what the fuzzy stuff is either mold or root hairs (hopefully the latter)
As for germination. I’ve decided this is a waste of time. Just chuck the seed in the ground, water and cover with plastic dome. This is what happens in nature (well not the plastic dome bit).