I have two types of Cotoneaster that grow near my home. One I've identified as Cotoneaster acutifolius , as was told it was edible, yet untasty. I found the flavor of these purple berries to be very mild, yet very good. I only ate a few berries at a time, and sparingly. There also are several coteaster shrubs that produce a red berry. My question is, are all berries in this family edible? I've read on here and a few other places that the berries are indeed edible, yet several other sources list them as "mildly" poisonous. Which shall I believe? And what does the "mildly posionous" entail? Are they cathartic? Do they cause stomach pain? Anyone know? I ask because last summer I discovered about 20 edible fruits near my home, and plan on harvesting quite a bit this upcoming season. I'd like to know if I should add these to the list! Thanks in advance.