Eden Project Warm Temperate Biome
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A grapefruit tree in the temperate biome at the Eden Project. This picture was taken in late April so the fruits are not yet fully-formed.

On the left is a Hazel tree which normally grows to about 6m tall but can grow as high as 15m. It is native to many areas in Europe, including the UK, and Asia.

Interestingly, the hazel tree is home to truffles which grow just below the soil surface around the roots of the tree. In the UK, hazel was grown as coppice and the branches and twigs were used for building walls and fencing.

The plant on the left is Acokanthera, commonly known as Bushman's Poison. The bushmen (Khoisan) used the sap to bind together the poison tips of their arrows. The sap itself is highly poisonous as are most other parts of this plant.

In small amounts, the plant is used to treat snake bites, intestinal worms and reduce aches and pains. I know I'm not going to try it!

Fig trees can grow in tropical and temperate climates. The "fruit" of the fig tree is unusual in the the flowers are on the inside of the fruit. The fig relies on small wasps to pollinate it. They crawl inside a small opening of the fruit. The wasps in turn extract food from the fruit.
In temperate zones, the wasps hibernate inside figs.

The Seville orange is mainly grown in Mediterranean areas. The fruit is much more bitter compared to a sweet orange making it ideal for marmalade amongst other things.
The high pectin content helps the marmalade to set better.