Ask a Question forum: Yellowing mondo grass

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Orlando, Florida
Greenskipper
Apr 23, 2018 4:18 PM CST
For the past 10 plus years, I have had a very healthy bed of mondo grass by the sidewalk at our house. In the last 3 years or so, it has slowly started to thin and become yellow and generally seems to be declining. Both the plants and roots have become small. There haven't been many changes, other than a few trees across the street that have come down which may cause the bed to receive a little more sun. It is east-facing, so in the afternoon it is still protected.

Recently I purchased plants to fill out the thin areas of the beds and try and make
the area look better. When I dug down, I noticed there were lots of tree roots below the bed, possibly from
a nearby laurel oak. Could it be that they have encroached and are taking nutrients away? You can
see that around the sprinkler heads the grass is still lush.

What to do? It is very frustrating!
Thank you!

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Name: Kyle
Middle TN (Zone 7a)
Region: Tennessee Plant and/or Seed Trader Cat Lover Dog Lover Roses Ferns
Hostas Foliage Fan Bromeliad Heucheras Native Plants and Wildflowers Birds
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quercusnut
Apr 23, 2018 9:18 PM CST
I'm not really sure unless they are drying out. I have tons of mondo and dwarf mondo here in TN and after 20+ yrs. they are as vigorous as ever.
If they were mine I would thinly topdress them with some seedless organic matter and keep them moist.
Maybe someone else will know exactly what's wrong and give better advice.
Orlando, Florida
Greenskipper
Apr 24, 2018 12:46 PM CST
Much appreciate your feedback! I wish mine was still as vigorous as yours! Good advice and if that doesn't solve the problem, I may have to take the soil out and add some new and see how that works! Thank you!
Name: Kyle
Middle TN (Zone 7a)
Region: Tennessee Plant and/or Seed Trader Cat Lover Dog Lover Roses Ferns
Hostas Foliage Fan Bromeliad Heucheras Native Plants and Wildflowers Birds
Image
quercusnut
Apr 24, 2018 1:05 PM CST
You're welcome. And I might add that I would make it an ongoing process. Add a little organic matter at a time so as not to smother them. For example I use my used potting soil to improve poor areas in my garden. Peat moss and soil conditioner (pine fines) also. You also might try fertilizing them with cottonseed meal or other organic fertilizers. Not that I'm against synthetics. I just prefer organic when possible.
[Last edited by quercusnut - Apr 24, 2018 1:08 PM (+)]
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Orlando, Florida
Greenskipper
Apr 24, 2018 1:08 PM CST
Thank you so much!

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