In order to bloom flowers, gotta plant the seed first. 

I am somewhat new to Bigger Pockets as well and in the DFW community near Lewisville / Flower Mound. 

-Landscape Maintenance (no grass, just trimming/maintaining palms, flowers, mulch, etc.)

Good question, my answer would be this: I am very sorry your father died, I will send you flowers and a card however your rent is due and if you do not pay it by ____ (whatever the grace period is in your state/lease) then you will incur a late charge, and the process for eviction will be started promptly.My advice would be, DO NOT let them think they can push you off and pay you later, it will become a constant thing. 

She is also asking for money to pay for the landscaping she did (that she did not ask permission for) because she cannot dig up her flowers and get her landscaping timber in the winter.

For a finishing touch, we added flower boxes!

Tenant agrees that all improvements installed in and on the Premises, including landscaping (bushes, shrubs, ground cover, trees, and flowers) shall, at the option of Owner remain with the Premises upon termination of the Lease at no cost to Owner .

Would rent out just the trailer for events where they could provide their own Kegs to tap in our trailer and it is refrigerated for storage of event food/flowers.

I have verbally told them they can plant flowers and such in the mulch area in the backyard as I want them to enjoy the space. 

I would then add flower boxes in front of the downstairs windows.