To a degree 'Diamond Frost' is a bit of a 'one hit wonder' because
although it is technically a short lived perennial. it is best grown
on from cuttings each year and most plants are treated with Cycocel to
encourage a bushy and more compact habit. Left to its own devices, it
is a more open, slightly taller plant. It is a cultivar of Chamaesyce
(Euphorbia) hypericifolia, which is a warmth loving 'spurge' native to
the warmer regions of the USA and central America.

The species proper is a low growing plant that revels in heat and
light, often turning purplish with exposure. It is becoming
naturalised in many parts of the world and seems to be acquiring
almost a 'weed' status, which shouldn't concern us unduly in our cold,
damp climate. It can be overwintered outside here, but only in very
sheltered, well drained spots and it certainly wouldn't survive many
-5C nights. Mine survived two winters only to be killed by an
unusually sharp, late frost in spring.

Good drainage is essential and 'Diamond Frost' is better overwintered
at around 5C and kept only lightly moist and in good light. You can
then take cuttings in early spring, but the resultant plants will be
somewhat more airy and open unless treated with the growth regulator.
Nevertheless, it is a very pleasant thing with or without the
retardant and makes a splendid foil for more vividly coloured plants.
It is glorious with dusky leaved Dahlias, but to my mind looks a bit
contrived when associated with rich purple leaved forms such as the
Llandaff 'tribe'.