I'm definitely not an expert but, I think they are very similar. Not to get too technical, but the botanical name is thuja occidentalis and among it are many cultivars of varying shape and forms.

Monrovia.com said Hetz midget is "Small evergreen shrub has dense, globe shaped growth habit. Rich green needles are arranged in flat layered sprays. grows 3 to 4 feet high and wide"

The same site mentioned about Little Giant: "Small, globe-shaped evergreen shrub. A very versatile and useful plant." and also said up to 4 feet high.

I believe I have hetz Midget at the side of the house and it's grows slow but steady, more like 2 feet high after 10 years.

Another sort of neat one is 'rheingold' which has golden foliage. It gets a bit bigger, according to one site anyway, up to 5 feet (though could be maintained at a certain height with annual trimming).

Where it mentions heights I would take that with a grain of salt - or research multiple sites to get a better idea (average) of the height/width.

Glen

Thanks Glen.

I guess if you've had them for 10 years, there can't be much of a problem with them or you would have gotten rid of them.

I'll have to look for larger ones though. I don't want to wait 10 years =:)