Castlejade is relatively uniformly-sized zucchini, 7.25 to 8.5 inches (18.5 to 21.5 cm) long.
It has smooth dark green skin with light green speckles.
The F1 hybrid plants are single stemmed.
Castlejade Zucchini was developed by the ARCO/Dessert Seed company. During development, it was referred to as “CHY 4005”. Released 1983.