Cistus 'Bennet's White'

Cistus ‘Bennet’s White’

Enormous white flowers are incredible while they are born from May to July on this classic rockrose. Resinous, deep green foliage is fragrant, especially as the temperature climbs. The 4″ wide pure white flowers that appear daily remind many of Romneya coulteri Matilija Poppy. To 4′ x 4′ in 5 years for full sun and well drained soil with light summer water. Extremely showy in bloom. Moderate deer resistance.

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Cistus x 'Snowfire'

Cistus x ‘Snowfire’

A large growing improved rockrose with huge white flowers with a large red basal blotch on each petal. Deep green foliage takes on maroon tints in cold weather. To 4′ tall and 6′ wide forming a dense outline. Blooms May to July in a daily procession of flowers. Each blossom is 3″ across. Excellent cold hardiness to 5ºF or lower. Grows quickly in average, well drained soil Avoid overly enriched sites which will decrease cold hardiness and lead to rank growth. Lean conditions produce the most dense and cold hardy shrub. Great for rough areas in the back ground. Completely drought adapted- no summer water required. Give it room to spread. I’ve had great success with this shrub on a hillside of rocky clay soil that is strictly unwatered in summer. It and all Cistus present the ability to compete with invasive weeds such as introduced grasses. These invasives quickly out compete many things, but not Cistus. Water deep and infrequently or once established not at all. Rock roses can be prone to breaking in ice/snow. Usually, it is just cosmetic and the plant recovers. Our selections we have observed through many snow events (including a 16″ fall in 2008) and have observed no breakage. One of the very best Cistus selections.

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Cistus x bornetianus ‘Jester’

We’ve grown a LOT of pink flowered rockrose. This is our favorite by far and several important distinctions make that so. The large flowers are clear pink on the edges fading to near white around the boisterous orange/yellow center. This gives each cupped flower a luminous backlit effect. It blooms profusely and the elegant but subtle flower color virtually marries its gray leaved backdrop. Excellent.  To 3′ x 4′ in 5 years ‘Jester’ exhibits great cold tolerance as well as drought adaptation. Full sun and well drained soil with little summer water once established. The large (3″) Pink flowers appear for 4-6 weeks in late spring. Fragrant foliage is waxy and could be unpalatable to deer. Long lived for this genus. Colorful, tough plant.

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Cistus x canescens 'Albus'

Cistus x canescens ‘Albus’

A tough, cold hardy, and spectacular Rockrose in bloom. Gray foliage is a great backdrop to the huge (3″) pure white flowers with a central zone of yellow stamens. The flowers appear daily but en masse for weeks in April to early June. Moderate growing evergray shrub to 3′ x 5′ in any well drained soil. Extremely drought adapted and requires NO supplemental irrigation when established. Avoid overly enriched soils which will lead to rank growth and quite a bit less cold hardiness. At our wholesale nursery this wonderful shrub has not suffered cold damage down to 5ºF. Lean conditions increase hardiness. Hellstrips, low water garden sections. Hot dry biomes. A great rockrose.

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Cistus x crispatus 'Warley Rose'

Cistus x crispatus ‘Warley Rose’

A fantastic low growing Rockrose with superior pink/purple (Pinkle?) flowers for an extended period in May-July. To just 18″ tall it spreads to 3′ wide in average to enriched soil in full sun. The crinkled sage green foliage emits a sweet perfume, especially if you stick your nose right up to it- but mostly it is noticeable on warm days. Its spicy and sweet and adds to the good feelings this very cold hardy selection gives gardeners. One of the last plants to be marauded by deer it makes a great border shrub for rural areas as well. Drought adapted when established, give it one or two good soaks in summer to keep it fresh. Well scaled plant that seldom requires pruning. This selection has survived 0ºF with minor leaf burn and a full recovery by bloom time. Flowers that each last one day come in a weeks long promenade. Rock gardens, hells strips.

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Cistus x dansereau 'Jenkyn Place'

Cistus x dansereau ‘Jenkyn Place’

After growing a whole bunch of Cistus this variety has risen to the top. Upright growing deep green evergreen shrub to 5′ tall and 5′ wide. The thin deep green leaves have the sweet fragrance of balsam. Beginning in May a constant procession of 3″ white flowers with a red basal blotch on each petal. Each flower lasts a day but there is a constant supply waiting in the wings. Full sun and average well drained soil. Tolerates clay soils well. If you give it a touch of supplemental summer water it will often extend the bloom season all the way until September. Exceptionally cold hardy. One of the finest rock roses.

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Cistus x ladanifer 'Blanche'

Cistus x ladanifer ‘Blanche’

Very large growing deep green aromatic Cistus with enormous clear white flowers for an extended period in May-July. The flowers are so large they are reminiscent of the Matilija Poppy (Romneya coulteri) and they virtually obscure the foliage in bloom. To 8′ tall x 8′ wide very quickly. The winding and shredding trunks that develop are cinnamon brown and have a wild, gnarly appearance with age. Excellent cold hardiness especially if you avoid rich, amended soils. Native unimproved soils that drain are best. Handles clay soils well especially if on a slope. Completely drought adapted, no summer water is required. The resinous deep green foliage emits a sweet balsam aroma on hot days.

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Cistus x obtusifolius

Cistus x obtusifolius

Compact white rockrose is a fantastic hybrid that gives this shrub several outstanding attributes. A dense compact habit heavily clothed in small deep green leaves. To just 3′ tall and 4′ wide forming a dome. This dense habit resists splitting in ice and snow. From May to July a massive constant procession of pure white flowers. Often bloom is so heavy that it obscures the foliage. Each flower lasts just a day but is replaced by a seemingly never ending supply. In autumn the spent flower calyxes turn bright orange red and are showy- especially when backlit by the sun. Great landscape shrub for hot sites in any well drained soil that does not become boggy. Avoid overly enriched soils for a more cold hardy and dense growing plant. Easy Cold hardy to near 5ºF. Little to no summer water.

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Cistus x pagei

Cistus x pagei

Rockrose are famous for the sweet balsam fragrance emitted from their foliage. The chemical ladanum is responsible and the heart shaped thick leaves of this hybrid are drenched with it. This chemical imparts a certain amount of fire retardant. Hot days bring a wave of perfume from Cistus x pagei long after its profuse display of pale pale pink flowers. Its vaguely pink from a distance.  Very heavy bloomer. To 5’x 5′ in 5 years. Exceptionally hardy to cold and very very drought tolerant as well. Tolerates subfreezing wind and temperatures near 0ºF with no harm. Excellent low care shrub for rough areas. Full sun and well drained soil. Light summer water to establish. Moderate deer resistance. Excellent shrub for rural areas. In time it develops gnarled trunks with a shredded exterior. Prune if needed AFTER flowering.  Rugged, beautiful, fragrant shrub.

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Cistus x platysephalus

Cistus x platysephalus

Excellent performance- including superior cold hardiness and incredibly floriferous is why we grow this moderately large spreading Rockrose. Grass green linear foliage in dense and always fresh on an upright and spreading shrub. Grows in tiers which is pretty and displays the copious single white flowers well. Flowers appear daily from May to July. To 3′ x 5′ and low and spreading initially then lifting itself up gradually. Excellent cold hardiness. We’ve tried many, many Cistus planted out at our Wholesale Nursery site in Wilsonville- at least one zone colder than the city of Portland. This carefree shrub has sailed through 5ºF multiple times with NO DAMAGE and thrives in clay soil on a hillside with absolutely no summer water. As with all Cistus avoid overly enriched soil and too much summer water. Neglect is this tough shrubs friend. Moderate deer resistance. This is confused in the trade and may also show up from time to time as ‘White Gem’- its not.

 

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Cistus x pulverulentus 'Sunset'

Cistus x pulverulentus ‘Sunset’

Compact low growing Rockrose with spectacular hot magenta flowers from May to July and sporadically after that. The large flowers (3″) cover the handsome felted light green foliage. To 2′ x 3′ in 6 years. Full sun and poor to average well drained soil. Light to little summer water. Hardier to cold and more compact if you avoid rich soil. Tough little evergreen plant. Protected locations like a hot south facing hillside are ideal.

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Halimiocistus x wintonensis

Clever llttle rockrose that deserves a place in a protected, hot, sunny aspect. Sage green dense foliage is a great backdrop to the spectacular 3″ wide cupped flowers. They are white with a zone of maroon at the base around a yellow center. Fun! Blooms daily for 4 weeks in May-June. To 2′ x 2′ quickly in RICH well drained soil in full sun. Light summer water. Great performance in the reflected heat of hellstrips. Beautiful in bloom. Combine with native hardy annuals for a wonderful wildflower spring display. No water necessary. Forms a rounded shape. Best with occasional summer soaks but tolerates drought..  Moderate deer resistance. Very good performance at the Oregon coast.

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Halimiocistus x wintonensis ‘Merrist Wood Cream’

For flowers alone this is the most spectacular Rockrose. A cross between Halium and Cistus produced this remarkable low spreading evergreen shrub to 2′ tall and 3′ wide. In April to June 2″ cream colored single flowers, the base of each petal is a maroon blotch Flowers appear daily for weeks. Attractive felted sage green/gray foliage is handsome even out of bloom.  Full sun and well drained ENRICHED soil- these hybrids prefer richer conditions.  Little or no water for established plants. Tip prune after flowering to shape. Protected location. Excellent performance in Hell strips. Amazing flowers.

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Halimium ‘Sarah’

The very best cultivar of Halimiums as judged by quantity and length of bloom. Golden yellow silky flowers have a deep maroon blotch at the base of each petal. Evergray, rounded shrub to 3′ x3′ in 5 years. Full sun and poor to average, well drained soil. Light summer water to establish then light water.. Blooms for an extended period from early May to early July. Prune after flowering to encourage a denser form and more flowering wood. Excellent wildflower display that pairs well with blue flowered plants. Ceanothus thyrsiflorus ‘Victoria’ flowers simultaneously and appreciates the same cultural conditions. Moderate deer resistance. Average lifespan 6-8 years.

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Halimium ‘Susan’

A very compact form of golden rockrose that is also an insanely heavy blooming machine. To barely 2′ tall and as wide in 5 years. Evergrey foliage is obscured in late spring to early summer with masses of daily golden flowers with a black center. Awesome wildflower effect that lasts for weeks. Full sun and average to poor well drained soil. Water to establish then no water or light water. Longer lived with neglect. Rock gardens, Hellstrips, etc.

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Halimium lasianthum ‘Sandling’

Gray spreading upright evergreen shrub that celebrates late spring into summer with profuse 2″ wide bright yellow silky flowers with a conspicuous tomato red blotch at the base of each petal. Each flower lasts but a day but there is such a profusion of blooms  waiting in the wings that they occur daily for 4-6 weeks from May to July. To 3′ tall and 4′ wide quickly in poor to average well drained soil. Water to establish then water lightly and infrequently during summer. Excellent performance in Hellstrips. Blooms simultaneously with Ceanothus ‘Victoria’ the blue and yellow blossoms a classic combination and both shrubs appreciate the same culture. Cold hardy to 5ºF.

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Halimium lasianthum ssp. formosum

Big spreading Halimium with arching furry gray stems lined with furry gray foliage. In May-July profuse 1″ wide silky yellow flowers with a basal blotch of deep brown appear massively each day. During the heaviest of bloom the foliage is completely obscured. Flowers last until about 4:00 pm and then the petals drop dramatically all at the same time. Full sun and average to poor soil with little summer water once established. One of the hardiest and easiest to grow. To 3′ x 6′ in just a few years. Very drought tolerant. Tolerates clay soils on a slope. Moderate deer resistance.

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Halimium ocymoides

Golden rockrose (Halmium)  is the other genus apart from Cistus. This dense rounded shrub to 2′ x 3′ is clad in evergray foliage and appreciates average, well drained soil in full, all day sun. Water to establish then only light occasional summer water. Blooms which are bright yellow and silky have a central zone of burgundy. One of the common monikers is ‘Black Eyed Susan Shrub’. Produces a great wildflower display for weeks in May to July. Lifespan is about 5-7 years but flowering is so profuse and long the risk is worth it. Cold hardy to 5ºF. Mediterranean native. Plant with Cistus, Grevilleas, Arctostaphylos, Pacific Coast Iris. Prune lightly after blooming has ended to shape, encourage a denser habit.

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Halimium x pauanum

Nice, upright golden rockrose with felted gray foliage and masses of flowers from May-July. To 3′ x 3′ in full sun and well drained soil of average fertility. Little to no summer water once established. The simple, silky, egg yolk yellow flowers shine for most of the day before dropping in late afternoon. They drop all at once- which is kind of cool. A massive new set of buds will be waiting for daily displays for weeks. Good cold hardiness unless soil in too enriched. Grow this baby mean and lean and you get better performance, a longer lifespan, and better cold hardiness. Hell strips, dry borders, gravel gardens. Light deer resistance. Average lifespan 5-7 years- longer with neglect. Prune after flowering has ended if needed. Excellent shrub for a new garden while you wait for focal plants to establish.

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Helianthemum ‘Annabel’

For several reasons this is a fantastic Helianthemum (Sunrose). Felted green/gray foliage is handsome as a backdrop to the masses of fully double pink flowers that appear for weeks. The single forms of Sunrose have flowers that last just one day but this double flowered form has flowers that individually last for days. It significantly lengthens the bloom time on this charming low plant. Blooms appear from mid May to July. To 10″ tall and spreading to an area 2′ x 2′ in several years. Full sun and well drained soil of rich fertility. Beautiful small scale groundcover for banks, drier borders, rock gardens. Its best to cut Helianthemums back hard when blooming has ended. Remove the blooming stems and part of the current seasons growth. In return you achieve a dense compact plant that will yield more flowers the following year. For pink-o-philes this is a must have plant and one of our favorites at Xera. Light summer water. Some deer resistance.

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Helianthemum ‘Cheviot’

Sunroses are great flowery perennials for hillsides and the front of borders. Low growing gray evergreen foliage is a great foil to the 1″ pale pastel apricot flowers that obscure the whole plant for weeks in mid-late spring. To 8″ tall  x 2′ wide. But back hard after flowering to encourage a denser more compact plant. Light, regular summer water is important- avoid total dust dry conditions. Mix with Pacific Coast iris and Penstemon heterophyllus ‘Electric Blue’ for a swoon worthy effect.

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Helianthemum ‘Henfield Brilliant’

Fantastic low growing gray leaved evergreen Sunrose for sunny slopes. Gray foliage is a great backdrop to the masses of brilliant deep orange flowers that obscure the foliage for weeks in April/May. To 6″ tall and several feet wide in just a few years. Light, consistent summer water in rich, well drained soil in full sun. Cut back hard after flowering to ensure a more compact, tidy plant. Blooms simultaneously as Spanish lavender (Lavandula steochas) for a wonderful purple and orange blast of color. Low spreading trailing habit is ideal on slopes or at the top of a wall. Match with other low spreading plants for a tapestry of color.

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Helianthemum ‘Stoplight’

This little gray leaved evergreen shrublet becomes a fire of true red flowers for 4-6 weeks in mid to late spring. To 10″ tall and spreading to several feed wide in rich, well drained soil with light but consistent summer water. Better in soil that has been enriched with a bit of compost and light organic fertilizer. Each flower lasts just one day but they come in such profusion that the display is continuous for weeks. Excellent slope cover- rooting where stems touch the ground- ideal erosion control. Cut back hard after flowering has ended. Cut approximately 1/3 of the plant away and new fresh foliage will emerge creating a solid mound of foliage. Very brilliant Sunrose that we love.

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Helianthemum ‘The Bride’

The combination of silver evergreen foliage and the clear white pristine flowers of this perennial is exceptional. To 6″ and spreading May to June the foliage is obscurred by a daily supply of flowers. Very showy. Full sun and light but consistent summer water. Cut back hard when blooming has ended. This yields a more compact tideir plant. Good deer resistance. Banks, hillsides, parking medians.

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