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Avatar for houseplantgrower301
May 3, 2020 3:09 PM CST
Portland OR
Could anyone give me some advise on my African milk tree (Euphorbia trigona)?

Yesterday (5/2) I noticed a few odd things. New leafs have black areas along leave edges. Directly below new growth is an area that appears to be dying and kinda see-through (not squishy). Could this be due to over watering? Or maybe some type of fungal disease? This is my first Euphorbia trigona so any tips/advice would be greatly appreciated!

Conditions: This plant is growing in a 3.5 inch clay pot on a south facing window. Watering roughly every 7 days when soil dries out. Last weekend (4/25), it received a 50% diluted house plant fertilizer (Schultz liquid plant food: 10-15-10).


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Avatar for oneeyeluke
May 4, 2020 2:18 AM CST
Name: one-eye-luke US.Vet.
Texas (Zone 8a)
Quitter's never Win
Birds Cat Lover Dog Lover Hummingbirder Organic Gardener
Back your water up a little bit, like every 10 or 12 days between watering. If you keep giving water every 7 days the spots may get worse. You caught it in time before the roots are damaged too.
NOT A EXPERT! Just a grow worm! I never met a plant I didn’t love.✌
Avatar for houseplantgrower301
May 4, 2020 12:25 PM CST
Portland OR
Ok great! Thanks so much for the advice, I'll lay off watering for a bit. So you think those black spots are due to over watering? Any thoughts about the damage on the succulent itself? Here is a picture from this morning.

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May 4, 2020 1:36 PM CST
Name: Baja
Baja California (Zone 11b)
Cactus and Succulents Seed Starter Xeriscape Container Gardener Hummingbirder Native Plants and Wildflowers
Garden Photography Region: Mexico Plant Identifier Forum moderator Plant Database Moderator Garden Ideas: Level 1
If you are watering when the soil goes dry at depth, you are watering at the right frequency. Once a week could be perfect at this time of year, but the way to figure that out is to check the soil moisture (not just at the surface, which dries out sooner).

The spots you have identified look like mechanical damage to me. What you need to be on the lookout for are changes to black or brown, or changes where the tissue of the plant feels soft. Leaf damage is absolutely nothing to be concerned about (as the leaves will drop in the near future), and a bit of stem damage just gives your plant character. Smiling I see no connection whatsoever between your primary concern and the watering frequency. Your plant looks like it's really thriving.

Provide the maximum possible amount of sun if this will be an indoor plant. Closer to the window would probably be better. Ideally it should sit right in front of a sunny, unobstructed southerly facing window and "see" the sun for hours a day year round. Light is important during any season but especially important during late fall and winter (and given the climate in Portland, that's when the sun tends to hide for weeks at a time).

Welcome!
Avatar for houseplantgrower301
May 4, 2020 6:23 PM CST
Portland OR
Terrific! Thanks Baja_Costero!! I was a little worried about the stem damage since it appeared out of nowhere this past weekend. It's definitely not at all soft or brown so I'll quite worrying Smiling Other than that it has been growing like crazy with all the sun Portland has been getting! This has been one of my favorite houseplants and always gets the best sunny window spot.

Given your comment about resembling mechanical damage, I suspect an encounter with the shade that a member of the house hold maybe forgetting about Sighing!

Thanks again!!
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