FREE: Hibiscus "Black Dragon" -- 8 seeds!!

Hello,
Questions- what zone, how fast do they grow, size, and do they have any special needs?
Thank you.
D

Winter hardy zones 7 and up, other zones bring inside to overwinter and bring back outside next spring...or keep it inside, it works well as a house plant as well, as long as it gents sufficient light, moisture and ventilation. This plant needs consistent moisture, but without sufficient ventilation and air circulation (such as hot summer inside without air conditioning for ex) it might develop fingus, No matter how hot the summer, this plant will always be ok outside, in open air, but again, you have to keep it watered:)
For ex, I am in zone 6A, Boston (hot and very humid summers , freezing winters with extended snowfall) -- I plant mine in pots, keep them outside on the porch, sidewalk or garden and after 1st light frost I bring them inside, or in the shed to overwinter. This plant is quite resilient, will tolerate 45-55 degrees or lower for a few consequitive days without loosing significant amount of foliage, but longer than that is not optimal and damaging for the plant, younger plants would not survive such an abuse, mature and well adjusted plants...well I am still testing their limits:)
They grow vigorously during growing season (late spring to late summer for me here in 6A).
The size depends on how you prune them, if you don't prune you will have a long plant (probably 6 feet and up, i never tried that, since mine are in pots). No pruning also means less branches with less blooms for the season.
Whereas if you prune consistently in the beginning of the season, you will have a slight delay in flowering, but then be compensated by a shortier (but wider), compact, vigorous bush that will surprise you with how many blooms it can produce! That is the way I go with all my hibiscuses. I hope that helps:)