Light green cannabis seedling — possible mutation?

Salam Habibi! 👋 Welcome to the nursery! 🌱 It is completely normal to look at that bright, neon yellow color and think you have accidentally grown a genetic mutant! But let's look at this through the lens of Modern Engineering to see what is actually happening under the hood. 🛠️ While mutations do occasionally happen, 95% of the time a seedling looks like this, it is experiencing an environmental block. Here is the mechanical breakdown of your seedling's engine: 1. The "Battery vs. Engine" Disconnect (Immobile Nutrients): 🔋 Look closely at your pale seedling. Notice how the two little round starter leaves (the cotyledons) are still dark, healthy green, but the new, jagged "true leaves" are pale yellow? The cotyledons act as the plant's "battery," containing all the initial food it needs. The true leaves represent the "engine," which relies on the newly formed taproot to draw up water and trace minerals from the soil. When new growth comes out completely yellow while older growth stays green, it usually indicates a lack of Iron or Sulfur (which are required to build green chlorophyll). Because these minerals are "immobile," the plant cannot pull them from the cotyledons. This means the root is currently offline or stressed and cannot pull minerals from the soil! 2. The Two Main Suspects for Root Stress: 🛑 Photon Overload (Light Stress): Seedlings are incredibly sensitive to light. If your LED is too close or turned up too high, it will physically "bleach" the chlorophyll right out of those fragile new leaves faster than the plant can produce it. ☀️ The Suffocation Trap (Overwatering): The taproot is currently the size of a single piece of thread. If the soil around it is saturated and heavy, the root suffocates. Without oxygen, it cannot absorb Iron or Nitrogen, leading to pale, stunted growth. 🌊 Your Engineering Rescue Protocol: 🚑 Dim the Lights: Raise your grow light or dim it down. Seedlings only need a very gentle light intensity (about 150-200 PPFD) to get started. The "Dry Down": Do not give her any more water! Let the top layer of that medium dry out so oxygen can reach down to the taproot. When you do water, only pour a tiny "halo" circle an inch or two away from the stem to force the roots to search outward. DO NOT FEED: Resist the urge to give her bottled nutrients! She is way too young and the salt will burn her. Give her gentle light, let the root breathe, and the next set of leaves should come out a beautiful, healthy green 🚀 HHappy Growing! 💚

Your possibly a little high on ppfd. My seedlings were growing under 250 ppfd and didn't like it and as soon as I reduced the light to hit 200ppfd they both started to look way better. So it could be because of the light or it could be a funky seedling. The decision you need to make is to lower light intensity or start over. If it was a photoperiod I'd keep it but as being an auto I'd be more tempted to start another seed. With autos you have no control over veg time so any genetic fuck ups or mistakes made will harm your final yield. I'm even tempted to germinate twice as many seeds as needed when doing autos and picking the best seedlings to finish of the grow.

You not to far down the road, they would still fit neatly inside of the bin. Then you can start over with regs or fems . In my experience they are a lot more user friendly and have the time to rebound from issue. Autos a large can run you over like a slow moving coup. They are not human and cannot be reasoned with.

WOW LOOK AT DAT!!! DAT YELLOW SEEDLING LOOKS LIKE ITS ON DAY 5!!!! DA YELLOWING CAN BE FROM LACK OF IRON FROM A LOCKOUT!!! DA PH OF DA MEDIUM COULD BE HIGH!!!! IRON LIKES A RANGE OF AROUND 5.5-6.5!!!! I WOULD CHECK DA MEDIUM PH I WOULD BET IT IS WELL OVER 6.5!!!!!

300 PPFD is the maximum recommended for seedlings. Lower intensity to 150 PPFD

nutrition.... needs some or it's locked out. based on looks i'd say it's a matter of presence, not lockout. Too much light could be a cause too -- if nodes are tight and not spacing out, adjust light, first and it may solve the problem. They don't look that tight but from this perspective it's difficult to be certain. if adjusting light power preceded it, also helps educate the guess. just to be cleaer on irrigation procedure.. 'overwatering' should be impossible. It's 99% a product of bad habits more times than not. 1) fully saturate 2) wait for appropriate dryback and repeat. As long as you aren't repeating too soon, shouldn't end up with rotten roots. If fully satruateing ever causes droop, it is the fault of the medium's constitution and nothing else. Also, the dynamices of tiny platns in large pots makes proper irrigation difficult. Avoid that as best you can no matter what 'bro science' says. Appropriately sized pots results in healthy, better plants in the long run. With a tiny plant you have to water a small circle, but make sure that moisture goes all the way down or else you train superficial roots - not ideal. It'll stay wet longer and have higher risk of root zonen issues etc etc... so, keep it simple and use appropriately sized pots throughout its life. I've done 400+ pot-ups and yet to see one slow down. Just doesn't happen as long as no one applies their retard strength and molests the rootball like a catholic priest in the backroom with a choir boy or behind Michael Jackson's rape door / kiddie bar bedroom.