Anyone have any idea what might be causing this?

This is my almost 4 week old mimosa auto, as you can see I'm currently having a bit of a deficiency/a tad bit of nutrient burn problem i think. Originally i thought it was just a Ca/Mg issue because i was using basic distilled water.

So i whipped together a microdose mixture with some calmag bloom city (0.375–0.4 ml per 24 oz) and have been adding about a cup of that for the past 2 watering sessions (I water every 3ish days), these photos were taken today (2 days after the last watering).

I have her planted in a 5 gallon fabric pot (Really only filled to like 4.5), with some basic perlite soil i think, with some Dr Earth tomato feed (1/4 cup) mixed into the soil (i mixed the fertilizer pre planting) and have her on a 18/6 light cycle, I measured the soil ph multiple times as of recently and I'm pretty sure its hovering around 6-6.5-6.6 (I only have basic ph paper strips)

The official chart from Dr Earth says to add another 1/4 around week 4 but I'm not sure if i should or shouldn't based on what's happening here so, some insight is very welcomed!

What light are you using? And exactly what is basic soil with perlite? What temperature is said plant growing under? Where did the seeds come from? A lot of ???

420 Garden said:

What light are you using? And exactly what is basic soil with perlite? What temperature is said plant growing under? Where did the seeds come from? A lot of ???

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Mars hydro TS-600 for the light (it for sure isn't close enough for light burn incase you were wondering)

garden magic potting soil (with dr earth tomato fert mixed in)

No idea what temperature as i don't have a therma inside the tent or a temp reader at all really, but based on feel imma assume its around 65-80F

i got the seeds from royal queens.

I was just the opposite on your light. Temperature is really important, you may want to get a hydrometer. That would help with both, temp and humidity. In veg you shoot for 60 to 70% rh. If your running an autoflower 80 degrees is the area for growth. In flower mid 70's. Air movement is also important, you want good air flow. Now your garden magis soil, is there any slow release food in just the soil? Miracle grow for instance, has food in the mix so adding to it out of the gate is not recommend. Next run try Ocean Forest or Happy Frog. Either one will feed your plants for a month by itself. Also I noticed it looks like very little perlite. When you have time look up soil mixes on here. There are tons of recipes for soil on here that are water only for the first month. Watering is a little bit tricky if your planting seed in a 5 gallon pot. Avoid watering right around the plant. You want the roots to move and search for water, that means water to the edges so that have to move to get water. If not the plant will have a small root mass because you make it too easy, they won't move if you give it right where the roots are. Keep in mind, what is going on under the soil is a direct reflection to what is happening above the soil. Look up Budzbuddha post's. He can help you lot's. Trust me he helped me tons.

Budzbuddha has a thread titled Hey dummy grow a plant. Simple soil container grow. He knows his shit and is always open to helping.

Pksv said:

This is my almost 4 week old mimosa auto, as you can see I'm currently having a bit of a deficiency/a tad bit of nutrient burn problem i think. Originally i thought it was just a Ca/Mg issue because i was using basic distilled water.

So i whipped together a microdose mixture with some calmag bloom city (0.375–0.4 ml per 24 oz) and have been adding about a cup of that for the past 2 watering sessions (I water every 3ish days), these photos were taken today (2 days after the last watering).

I have her planted in a 5 gallon fabric pot (Really only filled to like 4.5), with some basic perlite soil i think, with some Dr Earth tomato feed (1/4 cup) mixed into the soil (i mixed the fertilizer pre planting) and have her on a 18/6 light cycle, I measured the soil ph multiple times as of recently and I'm pretty sure its hovering around 6-6.5-6.6 (I only have basic ph paper strips)

The official chart from Dr Earth says to add another 1/4 around week 4 but I'm not sure if i should or shouldn't based on what's happening here so, some insight is very welcomed!


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This is what sucks with soil grows. Ph or ec of runoff water wont tell you anything and will just have you chasing your tail. Use tap water and unless your tap is from a well, or real shitty in general and you shouldnt have to worry about any cal mag deficiencies. I dont see any obvious issues with this plant. It is normal for the lower leaves to not do great in the beginning. Your top and new growth look normal/healthy

top leaves fine, bottom leaves not, probably a mobile nutrient, to me it looks like magnesium deficiency - make sure the ph of your water/nutes mix is in range before watering