Passiflora laurifolia, commonly known as the water lemon, is a species in the family Passifloraceae

Passifloraceae

Passifloraceae is a family of flowering plants, containing about 530 species classified in around 18 genera. They include trees, shrubs, lianas and climbing plants, and are mostly found in tropical regions....

.
The fruit is medium sized, ovaloid in shape, and the usual colours are a green or deep orange skin and white-yellow, extremely juicy pulp

Juice vesicles

The juice vesicles of a citrus fruit are the membranous content of the fruit’s endocarp. The vesicles contain the juice of the fruit. The pulp is usually removed from the juice by filtering it out...

.
The water lemon has an excellent pefumy-mild taste, without the tartness of the common Passionfruit. The water lemon is a type of passion fruit not yet widely known. It features a vigorously growing vine up to 30 feet long. Growing better in slightly humid climates, it isn't too picky about soil or water requirements other than liking ground moisture year-round.
It is almost always grown from seeds, but can be propagated by cuttings.
Bottom heating the seeds at 70-80F can result in germination

Germination

Germination is the process in which a plant or fungus emerges from a seed or spore, respectively, and begins growth. The most common example of germination is the sprouting of a seedling from a seed of an angiosperm or gymnosperm. However the growth of a sporeling from a spore, for example the...

 at 1–2 weeks, at lower temperatures seeds can take up to 10 weeks to germinate. The fruits are eaten fresh or used in drinks and bevarages. The water lemon is a native to tropical Americas

Americas

The Americas, or America , are lands in the Western hemisphere, also known as the New World. In English, the plural form the Americas is often used to refer to the landmasses of North America and South America with their associated islands and regions, while the singular form America is primarily...

. It is an invasive plant in the tropical region and has spread to many other parts of the world. Water lemon in the tropical, will not stand any frost

Frost

Frost is the solid deposition of water vapor from saturated air. It is formed when solid surfaces are cooled to below the dew point of the adjacent air as well as below the freezing point of water. Frost crystals' size differ depending on time and water vapour available. Frost is also usually...

.
Only occasionally cutivated but the fruits are usually available in markets wherever the vine

Vine

A vine in the narrowest sense is the grapevine , but more generally it can refer to any plant with a growth habit of trailing or scandent, that is to say climbing, stems or runners...

grows in wild. The water lemon fruits are able to grow in cold and hot countries.