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Posted 2Y ago by @LadyArrowhead

I have Yellowing leaves and black powder on leaves. (More...

#Syngonium
10ft to light, indirect
9” pot with drainage
Last watered 2 days ago
It was super happy, growing way to fast and roots were coming out of the bottom and top of the pot! I figured it was time to repot and give it a pole for its super long vine. I mixed up some potting soil with perlite, peat moss, compost, and a super chunky orchid mix per some recipes I found on here and online. The mix didn’t drain as well as it was supposed to, and I don’t think the pot had enough holes, so it was just sitting in moisture. One big old leaf started to yellow and the black dust started. A few days later I cut off the one leaf once it was completely yellow. Then another newer leaf started yellowing. I tried to get the soil to dry out faster. It kept declining slowly in some ways, but two new leaves still seemed to grow. Yesterday I repotted again to get it out of the moisture. Drilled a bunch more holes in the pot and added a bunch more perlite and chunky orchid mix in. Rinsed the roots and leaves. Roots looked good. Also, I didn’t bother to put it back on the pole for the moment trying to handle it as least as possible. Leaves are still yellowing and I think the black stuff is returning. The soil drains well now. Is it maybe compost burn? The compost I used was produced by the lomi earth mode which is supposed to be ready to use in plants. I also used a small amount of zoo poo (fertilizer/compost from the local zoo). I’ll try to add better photos in the comments when there’s more light.
Here’s the photos it wouldn’t let me add.
Oh and the pH is about 5, which it looks like online it needs to be about 6.5? So do I flush the soil? Add baking soda?
#greggang #syngonium
@JungleDreamer I could possibly be tagging you looking for a poetic response about the use of zoo poo. 😉
@LadyArrowhead Hi Bonney, Welcome to Greg. I've tagged a few groups above with the # to get more people to provide advice. I used @ as a tag for a very knowledgeable lady with a flair for prose.

If it were me, I would remove it from the pot, rinse the current soil/media away from the plant, and spray the whole plant (roots and all) with a fungicide like Captain Jack's with Copper Sulfate. Then I would make up new soil - just a bag of miracle grow houseplant, adding extra perlite, and orchid bark should be okay to help keep it chunky. Personally I stay away from adding moss as it can hold too much water.

And yes, poo 💩 can burn. It's best used if and only when it has set out to rot for a full year. So no funky additives for me.

If you want to continue with the pole, that's fine.
Continue with fungicide spray as directed on the bottle for a few weeks, until new growth is no longer exhibiting black powdery coating. As appropriate, remove yellowing/dying leaves.