The cardinal vine seeds are hard. What I do is rub the seeds with some sand paper, instead of nicking them. Also soak in warm water overnight.
By Unigrama from Alberton, MT
I found this on a web search:
Cardinal Climber vines are grown from seed. Cardinal Climber seeds can be directly seeded into your flower garden, or seeded indoors for transplanting later. If planting outdoors, sow them after the soil has begun to warm in the spring. Start indoor transplants 4-6 weeks before the last frost in your area. Space plants twelve inches apart.
Sow seeds early in the season and cover with 1/4" of garden soil. Water thoroughly. Cardinal Climber will begin to produce a continuous profusion of trumpet shaped flowers by mid-summer.
Tip: Soak seeds overnight before planting.
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