Houseplants are exotic plants that usually do not tolerate frost, but can survive in the house in a pot. They will also remain a lot smaller than their counterparts in open ground and in a climate where they have evolved. Some of them are edible, or have edible fruit. For enthusiasts so sometimes worth a try.

Around (the juice of) Aloe Vera (Aloe Barbadensis (Miller)) is a whole industry created with care and nutritional supplements. The juice can be used as a wound agent in (burn) wounds and sunburn. It is extracted from the cut off leaves, to collect the juice and let it dry in the air. From the bottom part is thicker resin harvested. From the higher part a gel. There is a list of medicinal properties attributed to it.
The plant has a laxative effect. The skin is very tough and difficult to digest. You can better first steam, boil or bake the leaves before you eat them.

Coffee, tea and cocoa are massively imported to make a drink. They are to grow as a houseplant. (Caffeinated plants do not grow here, so we have some surrogate (or import).)
Arabica coffee (Coffea arabica) is the most widely grown coffee. After three or four years you can harvest coffee berries.
Also suitable are canephora Coffea Robusta, Coffea arabica and Coffea arabica 'Catura' that remains smaller. Coffea arabica 'nana' is a compact dwarf variety and therefore even more suitable as a houseplant.

The tea plant (Camellia sinensis) should not be too wet. You reap the leathery leaves. Here unsuccessful due to lack of sun.

Cacao beans (Theobroma cacao) as a raw material for chocolate is in fruits (with a refreshing pulp) that grow throughout the year at the trunk of the cacao tree. The plant nees heat, moisture, fertile soil and shade.

Ginger is a spice extracted from the rhizome of Zingiber officinale. From a piece of rhizome you can grow a new plant. It’s about the root, use preferably a long flat tray, because ginger grows horizontally.

The dried inner bark of 1.5-year-old shoots of the cinnamon tree (Cinnamomum zeylanicum) can be ground to cinnamon.

The leaves of the curry tree (Murraya koenigii) are (fresh) used to make curries.

Capsicum chinense 'Bhut Jolokia is the hottest pepper in the world.

Eucalyptus gunnii could also be a houseplant. Of leaf essential oil is extracted, mostly known and used for the respiratory tract.

Lemongrass (Cymbopogon citratus) is an aromatic herb to be cooked or stewed in dishes, and is removed before eating. Get in the spring also the old stalks away. The plant is frost-free.

Lemon is generally propagated by cuttings. From a (peeled) pit you get a plant, but if there come flowers, it takes at least 10 years. But it's still a nice house plant. You can also try other citrus fruits (tangerine, grapefruit, lime). Fruits ripen from autumn to next spring, but are here barely edible.

After eating the miracle berrie (synsepalum dulcificum) sour and bitter things taste deliciously sweet. Lemon juice then tastes like sweet lemonade.

Other (room) plants with edible fruits

Annona conica has yellow, cone-shaped fruit, the annona edulis yellow-green fruit with white edible flesh and Annona squamosa or sweetsop has scaly fruit with white, sweet flesh with a texture like yogurt.
At sour cucumber tree grow the green juicy and tart fruit on the stem of this tropical Averrhoa bilimbi.

Peanut butter plant (Bunchosia argentea) has red-orange fruits that taste as peanut butter.
The whitish-yellow noni fruit (Morinda citrifolia Noni) are known from the noni juice that would be very healthy.

Sweet and sour sea grapes (Coccoloba uvifera) grow in bunches and color red when ripe.

Musa x paradisiaca (a natural hybrid between M. acuminata and M. balbisiana) produces banana.
Musa bauensis is a very rare species that is only discovered in 2002 on Borneo. The few white inflorescence is followed by bright yellow bananas.

The small remaining winged passionflower (Passiflora alata) has winged stems, red-purple flowers and bright orange passion fruit. The red passionflower (P. auranti) remains small.
Giant Passion (P. quadrangularis) with purple flowers is the largest. They can grow to 15 meters per year. The sweet fruits can be 4 kg heavy.
Also Passiflora ambigua Injo is a big one. Oenocarpus bataua Patawa is a tropical palm tree in the Amazon with purple fruits that taste like sweet chocolate and oil similar to olive oil.

Some plants that you can keep indoors here provide edible seeds.

Tamarind (Tamarindus indica) has pods with sweet-sour pulp that contains many sugars, vitamin B and calcium.

Rice (Oryza sativa) grows in a container on a damp, sunny spot indoors or in a greenhouse.

Peanut (Arachis hypogaea) grows as potato under the ground, on the stems of flowers. You see that nicely in a glass jar.

The somewhat toxic and bitter Candlenut (Aleurites moluccana Kemiri) is popped for use (as a binder in sauce ed.). The nuts are very oily. They can burn like a candle. The candle nuts are then tied together.

From the seeds of the little creeper Sacha Inchi (Plukenetia volubilis) oil is pressed full of omega fatty acids and vitamins A and E.

Valuable harvests you should not expect. But it is a nice hobby.

Eucalyptus
Eucalyptus is a fast grower that here can become max. 10 (instead of 70)meter high. The leaves are very thick and heavy. The essential oil is distilled at low pressure from freshly picked leaves. From 30 kg is gained about 1 kg of oil. Medical use is not for everyone safe (babies!). Some species are poisonous. Of some species is said they are (virtually) hardy.
Eucalyptus 'debeuzevillei' niphophila Eucalyptus and Eucalyptus species are the hardest.
Archeri Eucalyptus, Eucalyptus gunnii 'Divaricata' perriniana eucalyptus, Eucalyptus and Eucalyptus parvifolia neglecta are almost completely hardy species. Protect them in winter.
Eucalyptus gunnii Silver Tropfen is also kept as a houseplant.
To pluck the leaves, the trees can be pollarded.