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petals have black edges

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From: Jennifer P
Papillion, NE
it's early in the season and I only have a few bloomed velvety dark red roses. I've noticed today that the edges of the petals are black. Temps have dropped down into the 40"s the last 2 days. Can this be cause for the black edges?

Extension Message
From: James Schmidt
Extension Specialist, Home Horticulture/4-H
Department of Crop Sciences
Yes, cold temperatues will cause red roses to darken. Similar things happen with other plants and the pigments they contain in response to temperatures.

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