Hello,
We are planning to grow Karl Foerster grass in balcony planters for privacy.
We would like to see it reach it’s max height (4-5ft) – how deep (and wide) does our planter need to be?
Thank you for contacting Toronto Master Gardeners.
We do have information posted on our website on Camagrotisx acutiflora. The container used is specified as large.
This is a clump-forming grass which does not spread; to be divided after 7 to 10 years. The plant has basically no disease or pest problems, and requires little in the way of fertilizer; Even though grasses are drought tolerant, it may need more water than normal, due to it being in a pot, where soils dry faster. My suggestion is to have the largest pot possible with good drainage for your balcony. This will provide the grass’s root system room to grow. The larger the pot, the taller the plant.
I also found this website to provide good information on growing ornamental grass in pots.
This You Tube video provides information on ornamental grasses. Please note the size of the pots the grass is growing in.