The Carmello tomato is an indeterminate hybrid. An indeterminate tomato plant will grow and flower over an entire season. Heirloom tomatoes are varieties that will produce the same plant from the seeds, unlike hybrids.
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Marie Notnats enjoys learning about new topics and teaching people new skills. She has been writing professionally since 2008. She is a professional horticulturist with a Bachelor of Science degree in horticulture from Brigham Young University. She writes for About.com, Examiner.com, eHow, and assorted gardening blogs.