Gallon plant of Passiflora Holosericea A passion vine that is root hardy in zone 9 and above. The flowers on this plant are a very unusual, they have bright yellow, very long filaments with white petals. The trilobed leaves are very smooth soft green and 2 inches long. The vine grew to about 10 feet and was pretty much pest free. This is another one of my passion vines that is very hard to propagate and I usually only have 2 or 3 per season.