A shade lawn is turf asked to live with less sun than an open yard. The page that draws the line is shade and Florida lawns. Partial shade can hold Floratam. That is a wall with morning sun, or trees at the edge and open sky in the middle. All-day shade, the ground under a mature oak that is dark at noon, should not be sold as sod. The honest material there is a bed.
Bahia wants open ground. Zoysia wants sun and a tighter cut. None of the three is a deep-shade turf. Raising the deck will not create light. A crown raise that takes low limbs off a roof can let more sun in later, and that is a tree quote, not a promise that grass fills back the week the limbs come off.
What it looks like here
Partial shade that is mowed at 3.5 to 4 inches and actually watered can stay a lawn. The tall cut matters more there than in full sun, because a scalped plant has less leaf when the light is already limited. Deep shade thins, shade-tolerant weeds move in, and a new Floratam roll follows the old dead one. People call that a bad sod job. It was the wrong plant for the light.
A noon photo tells the truth a morning photo hides. If the ground is bright at noon, we can talk about grass. If it is dark at noon, we stop talking about grass. The bright side of the same yard can still be sod. The dark side can be coontie, mulch, and a rock strip at the slab, on the same visit, so you are not hiring a second crew to undo the first.
What we do about it
We will not sell the dark side as Floratam to keep the ticket simple. We will sod the bright side and bed the rest. Plants already on our list for the low light at a foundation include coontie, which stays put, and croton or viburnum only where they still get enough light to color. A sabal palm goes in only where the crown will clear the roof. Mulch around those plants. Rock near the slab, not piled on bark.
If a limb is also on the roof, that is tree trimming, quoted on its own. It can help the light. It does not replace the noon test. The line between a lawn and a bed is shade and Florida lawns.