Answer: Any possible warranty would be strictly through the retailer where you purchased the plant. (Monrovia is a wholesale only nursery and the retailers are independent stores.) I should mention though that most Agapanthus are only hardy to zone 8. A few are hardy into zone 6, but based on your zip code you are in zone 6A which is the coldest part of that zone. Depending on your microclimate where you garden, it could actually be as cold as zone 5 ... so I am not sure any Agapanthus would be expected to survive for you. I'm sorry I can't be more encouraging.
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