You might consider asking on the Houseplants or Container Gardening forums, which are both busier and more focused on the issues of growing in containers specifically.

Are you growing this indoors or outdoors? If outdoors, what zone?

Thanks for the advice.

I edited the categories.

Outdoors, in Zone 8

Coir is very water retentive, try putting a dowel (I use the big shih-kebab sticks) in the soil for about 15 minutes If it comes out moist, do not water.

Is it a new bag of coir? Coir can be very high in salts as they are grown in tropical seaside areas. Cheaper brands often get coir from large scrap piles and don't always flush the salt from them properly.

I will give that a try right away, allowing the mix to dry more between waterings. (I have been watering pretty frequently).

The coir has been potted and left out exposed to rain for several months. Im assuming it’s been flushed enough, but can’t be sure.

Ok, so overwatering was not the problem, because when I let the soil dry an extra day compared to before, the leaves have begun to dry up (wrinkled, shriveled, headed for crispy).

I’m now wondering if the MaxiGro nutrients are not working well with grass. (I’ve used it successfully with other potted perennials). So to change that up, I sprinkled 1 TBsp of slow release Miracle Grow into the top layer and watered deeply.

If if this doesn’t improve things, then my next guess will be the potting medium. But again, other plants have done well in the Perlite amended coir. I was trying to avoid peat.

It is a cool season deciduous grass. It is just going dormant.

webuser_447068953's ideas · More Info

Update:

The yellowed grass is now green again and growing larger.

Possible causes:

•Adjusted fertilizer formulation

•Drop in average temperatures

•Time for root development