How to grow Sweet william 'Rivendell'
Keep in mind when planting that Rivendell is thought of as hardy, so it can be safe to leave outdoors for the majority of winter (although if in doubt, using a row cover is often a good idea).
Growing Rivendell from seed
Transplanting Rivendell
As Rivendell is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.
Harvesting Rivendell