growing mondo grass - Knowledgebase Question

westmont, il
Avatar for jnpmnt
Question by jnpmnt
December 31, 2005
I don't understand why it is recommeded that mondo grass be divided every 2-3 years. I recently planted 3 ebony knight mondo grass plants in my rock garden about 12 inches apart. What will happen if I do not divide the clumps? Will the plants continue to thrive?

Answer from NGA
December 31, 2005
In my experience, mondo grass Ebony Knight" (Ophiopogon planiscapus 'Ebknizam') does not require division. (Perhaps the directions were intended for one of the clump forming ornamental grasses instead. Those do benefit from occasional division to maintain vigor throughout the clump. Over time, the center tends to die out leaving a sort of donut shaped plant.) This plant spreads by rhizomes, so you might want to control its spread by digging out the perimeter portions as needed. The resulting divisions can be replanted elsewhere. Also, I should probably point out that in your area (zone 5A, the coldest part of zone 5 and potentially as cold as zone 4 depending on the microclimate) mondo grass would be marginally winter hardy at best, so it might never get dense enough to worry about spreading. I hope this helps.

You must be signed in before you can post questions or answers. Click here to join!

« Return to the Garden Knowledgebase Homepage

Member Login:

( No account? Join now! )

Today's site banner is by Natalie and is called "Clematis (Clematis x jackmanii)"

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.