First plant looks like
Euphorbia (Euphorbia polygona var. horrida)
and not
Euphorbia (Euphorbia polygona 'Snowflake')
because the cyathia are green, not red.
E. resinifera is an awesome plant but it's not in a hurry to get huge. So don't skimp on the size there, if you can afford it. I will get out some time and take pictures of the 2 clones that have been in the hill above the house for about 10 years, very gradually working their way toward moundaliciousness.
E. venenifica here leafing out for summer....
