Strongly agree on Patrina to not prune dwarf varieties at all - once you start seeing how they grow, you will I am sure realize that they don't need it - they are not out-of-control growers like indeterminate varieties.
But they can get very heavy with fruit - so even though they are very stout and upright, they will topple and get top heavy with foliage and fruit. A short stake or cage is perfect - when you plant them in grow bags or pots in the driveway, that is when you get the toppling issue (as I experience each year!).
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Craig
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