Looks at how plants are able to move. The bramble is an aggressive example: it advances forcefully from side to side and, once settled on its course, there is little that can stand in its way.
An altogether faster species is the birdcage plant, which inhabits Californian sand dunes. When its location becomes exposed, it shifts at great speed to another one with the assistance of wind — and it is this that allows many forms of vegetation to distribute their seeds. While not strictly a plant, the spores of fungi are also spread in a similar fashion. One of the most successful (and intricate) flowers to use the wind is the dandelion, whose seeds travel with the aid of 'parachutes'. They are needed to travel miles away from their parents, who are too densely packed to allow any new arrivals.
Trees have the advantage of height to send their seeds further, and the cottonwood is shown as a specialist in this regard. The humidity of the tropical rainforest creates transportation problems, and the liana is one plant whose seeds are aerodynamic 'gliders'. Some, such as those of the sycamore, take the form of 'helicopters', while others, such as the squirting cucumber release their seeds by 'exploding'.
Water is also a widely used method of propulsion. However, most plants use living couriers, whether they be dogs, humans and other primates, ants or birds, etc., and to that end, they use color and smell to signify when they are ripe for picking.
-Wikipedia
Other Episodes:
The Social Struggle
http://www.videosift.com/video/Attenborough-The-Private-Life-of-Plants-Social-Struggle Growing
http://www.videosift.com/video/David-Attenborough-The-Private-Life-of-Plants-Growing Living together
http://www.videosift.com/video/Attenborough-The-Private-Life-of-Plants-Living-Together Flowering
http://www.videosift.com/video/David-Attenborough-The-Private-Life-of-Plants-Flowering
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