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Leslie,
Your idea should work well in zone 9. I live in zone 5 and have found that an emergency ( or even semi-permanent) cold frame can be constructed by making a 'box' out of bales of straw. Find a flat spot on you lawn, make the box, cover the bottom of the box with landscape fabric or plastic, put your trees in and then cover them to the rim of the pot with mulch. A sheet of plexi glass works very well as a lid. You will need to watch the temperature in the box and prop the lid open when it gets too warm. You can modify this arrangement any way you wish to suit your needs and climate. A member of another forum has succesfully over wintered Serissa in zone 7 using this technique, and most of us know how beligerent Serissa can be. I finally got the hang of it, but am a former member of the "I Hate Seissa Club"! Good luck.
TJ

23-Nov-2003	#10
shibumi bonsaiTALK Craftsman Join Date: Oct-2003 Location: Dover, Ohio Country: U.S.A. USDA Zone: 5/6 sunse AHS Heat Zone: 5 Posts: 55	Leslie, Your idea should work well in zone 9. I live in zone 5 and have found that an emergency ( or even semi-permanent) cold frame can be constructed by making a 'box' out of bales of straw. Find a flat spot on you lawn, make the box, cover the bottom of the box with landscape fabric or plastic, put your trees in and then cover them to the rim of the pot with mulch. A sheet of plexi glass works very well as a lid. You will need to watch the temperature in the box and prop the lid open when it gets too warm. You can modify this arrangement any way you wish to suit your needs and climate. A member of another forum has succesfully over wintered Serissa in zone 7 using this technique, and most of us know how beligerent Serissa can be. I finally got the hang of it, but am a former member of the "I Hate Seissa Club"! Good luck. TJ