I was thinking of using this to wrap my potted lilac at the base and fill it with mulch for the winter. Would this work?

Sure, your idea is ok, our 50% shade cloth is good for plant growth and insulation.

Can the 10' x 12" be stretched overhead to cover garden area, with no support in middle?

Can you? Yes. However, the product is "stretchy" and the more support, the better it looks and performs. For instance, even support provides less stretching of the fabric in the corners (or wherever it's tied). You should also take into account wind load which would affect durability of the product. In my case, winds can get high and I prefer to not worry about having to take it down/put it back up every storm.

50% Black Shade Cloth, 10 x 12 FT Durable Mesh Tarp with Grommets, Garden Sunblock Shade Cloth Shading Antifreezing for Plants Cover, Greenhouse, Barns Kennel, Patio, Tomatoes

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