Antirrhinum majus volunteers in the front garden

For once my soft-hearted refusal to pull up unknown volunteers has paid off. These little beauties showed up in our front yard; I'm not sure whence they came since we have never had snapdragons in the front yard as far as I can recall. It's surprising to me that they are doing so well here, since usually snapdragons prefer full sun, and the spot they're growing is part- to full shade.