Ignore the uptight weirdo who spends 10,000 words bashing this movie. It's very enjoyable as long as you're a fan of the genre. With many gratuitous LSD references and a real live carnival freak show, how can you go wrong?
If you thought Swamp Thing was too intellectual and The Fly was just too gross, this movie might definitely be for you. One of many human-cross-animal or plant movies, what causes this one to stand out is the overall creepiness of Donald Pleasance and, basically, the entire plot (what you can make of it).
Time-lapse photography inserted for no particular reason just adds to the fun.
The people who made this movie must have had a blast and so will you as long as you're not some amateur wannabe film critic. Sheesh!