Are Triffids precursors to zombies?

It's a long time since this post, but I agree 100%.

Another similarity is that both are attracted to sound.
They are also both largely invulnerable to bullets.
Triffids, like other plants have no brain, heart or other vital organs. They need to be cut to pieces, or burnt to stop them.
Zombies usually need the brain removed or destroyed to stop them. A bullet to the heart is usually ineffective, and they do not bleed out from lesser woulds like the living do.

One problem I have always had with the 'zombie apocalypse' is that there are thousands of populated islands around the world. Unless zombies can swim, it is hard to see how the infection could spread to all these islands.
The triffids neatly side step this problem. Their seeds are light and fluffy, and can be blown across the widest ocean.
Despite this, in the book, the main characters eventually join a community on an island. They have an annual triffid hunt, when they search the island for any new seedlings, before they become mobile and dangerous.
The writers of 'The Walking Dead' have done something similar. They have established that the virus infects the living also, but cannot 'take over' until the victim dies. What that means is that even if you can find a place which is 100% secure, like an island, sooner or later, someone will die from illness or accident, become a zombie and infect others.