Torn fabric as your awning ages it becomes more susceptible to wind damage if left open during a storm.
How to fix awning fabric.
The longer answer is that you need to get quality repair tape for awnings and apply it properly.
Unlace the awning far enough that you can lift up the corner.
The absolute best option is made by eternabond.
This is strong enough to patch roofs on rvs or campers and does marvelous on awnings for all fabric types.
Unroll the spring with a vise grip slide the spring out of the roller tube and roll the old fabric off of it.
When you take on fabric awning repair and reinforcing the seams you should use a cross or saddle stitch.
Insert the new awning into the channels on the roller tube and slide it all the way down to install it.
Most canvas patio awnings are laced on with awning line.
Follow the same procedure as for rips in the fabric body cutting your repair fabric long enough and wide enough to extend beyond the rip.
Glue it in place from the underside pressing it well.
The insidious growth of mold is one of the biggest enemies of a fabric awning.
Most awning fabric uses a single or double stitch to seal the seam.
There are two options depending on your budget.
At the first sign of mold growth removal of mold on awnings can be accomplished by spraying your awning completely with a hose and then applying a mildew remover.
The combination of water and heat that awnings are exposed to can create fertile ground for mold growth.
These are adequate stitches but not the strongest.