Answer: Seedless tomato seeds are available from Territorial Seeds, PO Box 157, Cottage Grove, OR 97247-0061. (Phone 541-942-9547) Look for 'Santiam", 'Siletz', or 'Oregon Spring' in their catalog or online at http://www.territorial-seed.com.
I should warn you, however, that the first fruit produced by seedless tomato plants are seedless, but the last fruits can sometimes contain seeds. Just scoop these out prior to eating and you'll enjoy each and every tomato from your plant.
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