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Yes Véronique, they're in a greenhouse, in pots. The wind and rain of a typical Irish winter would soon ruin them I'm afraid However even under glass the low light levels attenuate their growth & probably the intensity of flower colour too.They're grown in tall pots with oak/beech leaf mould at the bottom for some nutrients & moisture retention, with a fairly lean well-drained mix above (about equal parts loam, sand, grit). I also feed them with an inorganic or seaweed fertilizer a few times over the season.