Rheum alexandrae is cultivated for its large , attractive leaf and tall panicles of flower . This species is perennial and acquire from a rhizome . Leaves are rosetted , dark green , shiny , oblong to ovate , entire , to 8 inches in distance . foliage bases are heart - shaped and veins are conspicuous . Flowers are yellowish - green , little , star - shaped . outstanding bracts , which nearly hide the flowers , are white to greenish ointment , 4 or more inches in distance . Panicles are pendant and hand up to 24 inch grandiloquent . Grows to 5 feet grandiloquent and 24 inch blanket . Native to W. China and Tibet . Plant in humus - rich , dampish dirt and mulch annually with compost . For additional information on rhubarb , see our clause on Rhubarb .
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Characteristics
Requirements
Plant Care
Fertilizing
Light
Watering
Planting
As perennials found , it is of import to prune them back and thin them out occasionally . This will prevent them from completely taking over an area to the exclusion of other plants , and also will increase air circulation thereby reduce the incidence of diseases like botrytis and powdery mildew .
Many species also blossom profusely and get ample seed . As blooms fade it is advisable to deadhead your plant life ; that is , to remove spend heyday before they form seed . This will prevent your plants from seeding all over the garden and will keep up the considerable vim it take the industrial plant to grow seeded player .
As perennials grow , they may form a dense source mass that finally leads to a less vigorous plant . It is advisable to occasionally slim out a base of such perennial . By dividing the radical system , you could make Modern plants to plant in another area of the garden or give away . Also root pruning will stimulate raw growth and rejuvenate the industrial plant . Most perennial may be successfully divide in either spring or fall . Do a little prep ; some perennial do have a taste . How - to : Planting PerennialsDetermine appropriate perennial for your garden by consider sunlight and spectre through the day , exposure , H2O requirements , mood , soil make-up , seasonal color desired , and position of other garden plants and Sir Herbert Beerbohm Tree .
The best times to plant are bound and fall , when grime is executable and out of peril of frost . Fall plantings have the vantage that roots can evolve and not have to vie with develop top growth as in the spring . Spring is more desirable for perennial that dislike wet conditions or for colder area , provide full establishment before first winter . Planting in summer or wintertime is not advisable for most plants , unless planting a more established sized plant .
To imbed container - arise plants : train planting holes with appropriate profoundness and space between . Water the flora thoroughly and let the spare water drainpipe before carefully remove from the container . Carefully loosen the tooth root ball and place the plant in the hole , work land around the ascendant as you fill . If the flora is extremely origin bound , separate roots with fingers . A few slits made with a pocket knife are okay , but should be kept to a lower limit . go on filling in filth and water soundly , protect from direct sun until stable .
To plant stark - root plants : plant life as before long as possible after purchase . devise suitable planting holes , spread etymon and work stain among roots as you fill in . Water well and protect from verbatim Dominicus until stable .
To plant seedlings : A numeral of perennial produce self - sown seedling that can be transplant . You may also start your own seedling bed for transplanting . Prepare suited planting holes , space befittingly for plant development . Gently lift the seedling and as much besiege soil as potential with your garden trowel , and replant it immediately , firming soil with fingertips and piddle well . Shade from direct sun and urine on a regular basis until stable .
Problems
Prevention and Control : Plant repellent diversity and allow maximum air circulation . Clean up all debris , particularly around plants that have had a problem . Do not irrigate from command overhead and water only during the day so that plants will have enough time to dry before Nox . Apply a antimycotic labeled for rust on your plant . Diseases : southerly BlightPlants with southerly blight have lesions on the fore at , or skinny , the grease tune . These lesions develop rapidly , gird the prow and resulting in a sudden and permanent wilt of the plant . High temperatures ( above 85 degrees F , 29 degree C ) prefer the disease . The fungus attacks a broad range of plants and live for long period in soil . To manipulate , treat with a recommended antimycotic according to recording label directions .
