I have grown a few peppers in containers but even a 10 gallon container didnt yield nearly as well as in the ground. but I can say I don't think I would consider keystone giant a viable candidate for container growing. it is a rather vigorous plant about 30" tall or so.
and this was copied from smartgardener.com site on the keystone variety. I pasted it here.
Containers?
Yes, but will need a large one, like a half wine barrel
Choose a container at least 16" in diameter. A container with drainage holes is a necessity in order to successfully grow peppers. Cover the holes with weed cloth, newspaper or any other similar material and then fill with potting soil. Peppers love warm weather and will not thrive if temperatures are either too cold or too hot. Place peppers in full sun in warm climates, but be sure they have access to shade in hot temperatures. Keep well-watered. Stake to keep fruit off the ground, mulch for disease and weed control.
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carolyn k
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