Measure the length of the Italian sweet pepper with a tape measure to determine if it is ready to pick. Pick Italian peppers when they are 6 to 8 inches in length.
Examine the color and brightness of the Italian pepper. Young peppers are bright green while mature peppers are bright red--indicating ripeness. Red peppers are sweeter in flavor than the green ones; yet, peppers in both stages can be roasted.
Move the leaves around the Italian peppers so you have a clear view of the peppers. Cut the pepper from the bush 1/4 inch up the stem with gardening shears.
Rinse the peppers under cold water to remove dirt and pesticides. Store the Italian peppers in an airtight container in your refrigerator or freezer to ensure freshness until you are ready to roast them.