By our calculations, you should look at sowing Merveille des quatre saisons about 60 days before your last frost date.
By our calculations, you should look at planting out Merveille des quatre saisons about 45 days before your last frost date.
Territorial sells this variety as “Continuity.” According to Heritage Harvest Seed, this variety was described by Vilmorin pre-1885.
Merveille des 4 Saisons, meraviglia
Continuity, Marvel of four seasons, Wonder of four seasons, Besson rouge