In this Gardener's HQ guide, we'll explore cultivating Helianthemum plants in your garden, indoor spaces, and other settings.
Plants of the Helianthemum plant genus are half hardy or hardy perennials that have a shrubby nature.
They may reach a height of about 30 cm (12 inches). This makes them ideal for use in rock gardens. They are also great for filling the gaps between stones in drystone walls and paving.
Helianthemum syriacum by ch.deff.
The foliage of Helianthemum Plant is silver or green in colour
They flower from spring to autumn (species specific) with flowers of orange, scarlet, yellow or bronze.
Helianthemum almeriense by Peter M Greenwood.
Some of the common names for Helianthemum include Sun Rose, Rock Rose and Frostweed.
Species Specific Grow Guide for Helianthemum nummularium.
Helianthemum nummularium (Common Rock-rose), photograph by Ragnhild&Neil Crawford; CC.
Helianthemum canadense (Longbranch Frostweed / Canada Frostweed / Rock frost / Frostplant), picture by Aaron Carlson; CC.
Helianthemum plants can be grown directly outside by sowing seeds on the soil surface in late autumn, or before the first frost of spring.
Sun Roses (and other Helianthemum), as per the name, like to grow in sunny areas of the garden.
It is very important that the soil they grow in has good drainage, but the quality of the soil is not as important.
If you plan to start growing Helianthemum seedlings indoors, then they should be prepared about eight weeks in advance. Pput the Helianthemum plant seedlings out into the garden following the last frost of spring.
It usually takes them about three weeks to germinate. This should be done at a temperature of 21 to 24 degrees centigrade (70 to 75°F).
Helianthemum Care: If you require more sun roses / Helianthemum plants in the garden, then simply take cuttings at the end of summer.
Unfortunately, members of the Helianthemum genus are not the easiest plants to look after: they have short lived flowers that should be removed once they have finished blooming.
Once the flowering has completed, it is best to then cut back about a third of the plant; so that it becomes shapely; this may also lead to a second bloom.
The Helianthemum genus comprises about 110 species, offering a great variety of colorful options for gardens.
Yes, Helianthemum species, known as Rock Roses, are excellent choices for rock gardens and landscapes due to their hardiness and beautiful flowers.
The Helianthemum nummularium, commonly known as Common Rock Rose, is frequently chosen by gardeners for its bright yellow blooms.
While not particularly known for their scent, Helianthemum species are adored for their abundant and vibrant blooms.
Helianthemum thrives in sunny, well-drained spots. They're great for rockeries, borders, and gravel gardens.
Presently, Helianthemum is not listed as invasive in the USA.
To remove Helianthemum plants, dig up the plant ensuring to remove as much of the root system as possible to prevent regrowth.
The Helianthemum genus, part of the Cistaceae family, includes shrubs and perennials commonly known as Rock roses. Native to the Mediterranean and Middle East, they are cherished for their bright, rose-like flowers and evergreen foliage. Helianthemum nummularium is one commonly cultivated species.
Helianthemum should be planted in well-drained soil under full sun. It is drought-tolerant and thrives in poor, sandy, or gravelly soils, making it an excellent choice for rock gardens. Propagation is typically achieved through seeds or cuttings in late spring or early summer.
I hope that you enjoyed this guide on how to grow Helianthemum plants. You may also enjoy the following Gardener's HQ growing guides: How to grow Rock Rose; Purple Rock Cress, Rock Purslane, and Rhodohypoxis plants.