Both kinds flourish in dryish soil, on dry sunny parts of the rock garden.
It should then be thrown together in ridges and frequently turned, so as to be kept in an incipient state of fermentation, a little dryish friable loam being mixed with it to retain the ammonia given off by the dung.
Interesting caryophyllaceous plants, thriving in dryish situations.
They should be planted to a depth of 6in / 15cm in a dryish soil - crown imperials will not thrive in wet soil.