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Posted 1M ago by @ProlificTagetes

Black/brown spots on petioles

#Philodendron #WhitePrincessPhilodendron I can’t for the life of me figure out what’s happening with my white princess. I’ve inspected thoroughly for pests (maybe it’s something I can’t see?)
New leaves are also having trouble unfurling. I live in a pretty dry area so I’ve added a small humidifier near her, but maybe it needs more?
I let her *almost* fully dry before water.
It’s also 3 separate plants in the one pot, which is how it was when I got it. Should I separate them? Any help is appreciated!
The three plants in one pot could be an issue if they are growing on top of one another.

Philodendrons hate drying all the way out before waterings. They are native to the rainforest in South America its never fully dry there and it's humid. I've had the most success with a self watering pot and a thick rope. I keep the wate reservoir full and when it gets low I top it off. She is never dry though.

I have another philodendron moony who is declining pretty fast and she's not in a self watering pot and I let her completely dry out before watering. 😅

She's suffering and I need to change her pot to self watering.

I crate my own using a plastic liner and a ceramic larger pot. I use white rope and I make a cross inside of the liner and pull the rest of the rope through. I fill the ceramic pot with water snd leave them alone on my porch.

They get partial sun and 1 to 2 hours of full sun when the sun sets.

Also if you suspect bugs. I use cedarcide spray and wipe my leaves and stems down every two days (I'm meticulous).
I know you said you inspected for insects, but have you sprayed or applied anything for bugs? I’d apply to be safe, because sometimes you just don’t know, especially if you can’t see them. Ground cinnamon added to your soil is a good deterrent, you can make a solution from neem oil/pepermint oil/castile soap/water and apply it for treatment and prevention.

The reason I think it might be an insect, is in your second photo, the perfectly round hole reminds me of what carpenter bees do to wood, so I wonder if it *is* insect activity, just on a smaller scale than a carpenter bee (which are huge!).

Just my thoughts, good luck! 🍀💚
Oh, and I agree with @Travanote1 about the humidity, these tropical house plants really thrive in humidity. I live in the Rocky Mountains and it’s dry! My kitchen used to be 35% humidity on a good day, my plants hated it. They’ll love any extra humidity.
@Travanote1 how are you able to use a wick without it soaking your plant and it turning to root rot? I’d love to know what you’ve done to find success with it. I haven’t yet, I’m still figuring that part out.
@EZLennyLance Hello! I make sure to add at least a 1/4 of orchid bark and perlite to make sure that the soil is aerated.

So far she's been in the pot since I got her. No signs of root rot yet. She's put out two leaves since and that's more than I can say for my red sun and moonlight philodendron.
@Travanote1 Thank you for the insight! I do plan on using something for pests. I’m currently doing research on what would be best to use
@EZLennyLance Thanks! I do plan on applying something for pests, I just haven’t decided on what yet. Doing some research!
@ProlificTagetes I wish you the best with your philodendron white princess. ☺️
@ProlificTagetes I like Arber insecticide for active occurrences and the neem oil concoction for prevention. @TheOddAsity what is the neem oil recipe you use?
Here is the recipe. Just remember that neem can make a plant photosensitive for a bit.

24 -32 oz spray bottle
1 tsp neem oil
1 1/2 tbsp Castile soap
3-5 drops peppermint oil.
Fill the rest of the spray bottle with water.

Shake in bottle. Apply liberally to dirt and leaves. It is antibacterial, anti microbial, antifungal and pests hate peppermint. It’s a great leaf cleaner. I apply at least monthly. It’s organic so it breaks down faster than commercial sprays.