Orchid oddities: How some orchids aren't just pretty but really quite weird

A Cattleya trianae orchid

KEW Gardens' annual orchid festival takes place this month and to mark the event Kew horticulturist Elisa Biondi offers some weird and wonderful facts about orchids:

1. Some grow downwards: Stanhopea, from the rainforests of central and south America, flower out of the bottom of the container from which they grow, so are best grown in wired hanging baskets.

"When people started to cultivate this plant, they thought it simply wasn't flowering, but when they tried to repot it, they found out that the flower was inside the pot. The flower spikes grow downwards, so we plant our stanhopeas in hanging baskets, where eventually they find their way out."

2. Many grow on tree trunks: Epiphytic orchids grow on tree trunks and branches in the rainforest. The seeds arrive there and then grow and grow towards the light. If the orchid becomes too big for the host tree, it will collapse.

3. Some end up a rubbish dump for ants: Ants often gather inside the pseudobulb of the Myrmecophila orchids, where the leaves emerge, and deposit debris. Several species of ants do this, leaving behind other dead ants and bits of plant material.

In the canopies of the rainforest, there's no access to a lot of nutrients a lot of the time. Having this damp material can help the plant, which can get nutrients from it.

4. Others attract hummingbirds: The Cattleya trianae is the National flower of Colombia, known for attracting hummingbirds. The strong pink colour is clearly visible to the birds, which is why they are drawn to it. They are able to collect its nectar with their long beaks and tongues.

5. There are huge types: "One of the biggest we have is the Grammatophyllum speciosum, which is gigantic," says Biondi. The leaves can span 1m. The plants can grow up to 1.5m and the flowers are about 5-10cm, growing into a flower spike, in yellow with brown speckles, a bit like a leopard.

6. They can fool bees: The bee orchid looks like a bee. A male bee will be attracted by the orchid flower and try to mate. While he's there, the pollen gets stuck on him and he will then fly to another 'bee' flower on the same plant.

:: Kew Orchid Festival ( runs from February 9 to March 10.

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