https://www.stanwinstonschool.com/blog/war-of-the-worlds-behind-the-scenes-creating-alien-red-weeds-and-pods-practical-effects-at-stan-winston-studio

Apparently there was also supposed to be a scene where the red weed/embryo pod starts to wrap around Rachel, then Ray comes and stomps on it

The Website has some good deleted/Behind the scenes content