Tenant Let Lawn Die - Have Lawn Care Addendum - What to do?

[Lance Cothern]

Hi! I have a tenant that we told we will not be renewing their lease because we will be selling the townhouse. We gave notice about a month ago and their lease ends June 30. I drove by the unit today and noticed they have let the yard completely die. This is sad because they kept it up for the last 2.75 years. Here is the lawn care addendum we have as part of the lease 

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So based off of this, should I give them notice after I receive the last rent check that they either need to fix the lawn or they'll have to pay for it? Or should I just take it out of their security deposit? I don't want to bring it up before I get the last rent check because I only took a 1 month's security deposit and do not have the last month's rent payment yet. I am afraid if I tell them about it before I get the last rent check they will try to not pay the last month rent and just say use the security deposit for it.

I have had no problems with these tenants up until this point. They're reasonable people. Thanks for any and all help!

Lance