Purchased Lobelia gibberoa seeds from Nesltebrea Exotics in New Zealand (they have on line cat) approx 5 years ago. Germination was reasonably easy, subsequently lost some of the seedlings when transplanted outside. At 2/3 years they were up to approx 8 feet tall, a major fire burnt them to the ground but they regenerated, they are now back up to 6 feet

Hardiness - I garden in the SW UK coastal site, a hostile Z10 temps down to 0C but heavy rains and severe winds from the Atlantic, exposed about 100 yds from the sea
The plants tend to lose all their bottom leaves becoming very leggy and not attractive, some wind burn has occurred on the leaves. to date the plants have not flowered
The soil is good well drained and loamy

Frank