What is the largest seed in the plant kingdom?

The tree generally grows to 25–34 m tall. The mature fruit is 40–50 cm in diameter and weighs 15–30 kg, and contains the largest seed in the plant kingdom. It can reach about 12 inches (30 cm) long, and weigh up to 40 pounds (18 kg). The fruit, which requires 6–7 years to mature and a further two years to germinate, is sometimes also referred to as the sea coconut, love nut or double coconut