Herbs forum→Rosemary leaves turning yellow?

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(Zone 7a)
jdolinger
Sep 3, 2020 12:22 PM CST
Hi there, I've got this rosemary plant that I bought as a small seedling in spring 2019, and managed to nurse it through its first winter inside with some growlights (after two previous failures Crying I live in the Northeast US). This summer it finally started to take off a bit and has turned into a real plant and I was feeling good about finally having enough to start harvesting next summer. Just in the last two weeks however I've started to notice a few yellow curling leaves. Not many, but its really disturbing me, I have a lot invested in keeping this guy alive! This has coincided with the shortening of the amount of daylight we are getting here as we move into fall. Could that be causing this as it hardens up for winter? Or is this something worse? I've read about possible iron deficiency in the soil, is there something I should be using to fertilize? Please help!





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Name: Zoë
Albuquerque NM, Elev 5310 ft (Zone 7b)
Region: New Mexico Herbs Salvias Composter Bee Lover Container Gardener
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NMoasis
Sep 3, 2020 11:32 PM CST
Your rosemary looks healthy. It will naturally shed occasional old leaves throughout the year. However, it does like full sun, and if it was in full sun but is now in partial shade because of the changing light, that can cause it to yellow, but unless you see dramatic yellowing and dieback, it should be fine. If you can, move the pot for maximum sun exposure. Don't give it fertilizer now, wait until spring, and then VERY diluted. Cut back on water as the days shorten and temperatures cool.
For me, gardening is really just an excuse for playing in the dirt. Admittedly, plants are a satisfying by-product.
Name: Kim
Black Hills, SD (Zone 5a)
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KFredenburg
Sep 4, 2020 10:05 AM CST
What Zoë said is awesome advice. The only thing I'd like to add is that rosemary leaves will turn light green, and that is actually a sign of it being healthy. If they're a really light green, then that means the flavor will be better when using the leaves in cooking.
Love is patient and love is kind. Always be loving and kind to one another.
(Abridged from 1Cor. 13:4)
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Name: Zoë
Albuquerque NM, Elev 5310 ft (Zone 7b)
Region: New Mexico Herbs Salvias Composter Bee Lover Container Gardener
Bookworm Cat Lover Enjoys or suffers hot summers
Image
NMoasis
Sep 4, 2020 10:27 AM CST
Hey Kim, thanks. *Blush* I didn't know that about the light green. I just harvest from the succulent, new tips for cooking. When I cut back my massive 6-foot-plus Arp, I use the older leaves to brew tea for a hair rinse. The flavor isn't the point. Smiling Makes my hair shiny but does stain the tub.

@jdolinger, I didn't ask if you're bringing it indoors again for the winter. If so, a highly diluted balanced or low-nitrogen fertilizer could be okay. Not much, though.
For me, gardening is really just an excuse for playing in the dirt. Admittedly, plants are a satisfying by-product.
Name: Kim
Black Hills, SD (Zone 5a)
Discover more wildflowers
Aroids Snakes Enjoys or suffers hot summers Tomato Heads Critters Allowed Vegetable Grower
Bulbs Annuals Butterflies Cut Flowers Farmer Native Plants and Wildflowers
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KFredenburg
Sep 4, 2020 11:05 AM CST
nmoasis said:Hey Kim, thanks. *Blush* I didn't know that about the light green.


You were more of a help than me (you provided way more info)!
Love is patient and love is kind. Always be loving and kind to one another.
(Abridged from 1Cor. 13:4)
Let’s talk about Animal Fun Facts, Birds, Trees/Shrubs, or Oleanders!
Name: Kat
Magnolia, Tx (Zone 9a)
Region: Texas Container Gardener Herbs Moon Gardener Enjoys or suffers hot summers Heirlooms
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kittriana
Sep 6, 2020 8:42 PM CST
For the NE that is a really good looking rosemary, but you do know that trimming them keep them growing? Less daylight hours does affect them. Unlike the gals above, I adore the strong rosemarys for my cooking. I do have Tuscan Blue and my daughter likes it. Mine is needing trimmed desperately and I have neglected it through August. There is probably info on the net about the daylight hours it likes to keep it healthy- mine lives outdoors all year. By 11 hour day lengths and 60* it is kicking into grow season (March for me). Mine is woody at the bottom of the stems, but it is natural for our humidity, and the fact I let it go too long before snipping it back.
So many roads to take, choices to make, and laughs to share!

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