Green Roofs and Sedum
Kort sagt og hurtigt oversat fra engelsk, hvorfor Sedum er meget egnet til disse grønne tage
Sedum kan modstå tørke, som fx meget varme somre, er nemme at passe, kræver meget lidt vand og næring, er meget modstandsdygtig over for sygdomme og skadedyr, og har desuden stor tilpasningsevne under ekstreme vejrforhold.
Sedum findes ofte i tørre og / eller kolde områder, hvor vand kan være sparsomt. De kan opbevare vand i bladene og er i stand til at modstå forskellige vejrforhold, fra -25 ° C og op til 40 ° C.
De har ret overfladiske rødder og kræver kun beskeden dybde i underlaget. De lavtvoksende Sedum-arter har desuden overlegen evne til at overleve i et underlag så tyndt som 2 til 3 cm.
Stoffskiftet hos Sedum adskiller sig fra andre planter. Om natten absorberes kuldioxid gennem spalteåbninger (stomata) og omdannes til æblesyre. I løbet af dagen nedbrydes æblesyre, og fotosyntese finder sted under påvirkning af sollys. Spalteåbninger i bladene er kun åben om natten. I løbet af en varm og tør dag minimeres tabet af fugtighed.
Så jeg vil egentlig påstå de er perfekte til min altan, i ikke alt for dybe altankasser, potter osv, i meget sol på dagens varmeste timer og meget udsatte for vinden, foruden de har en ejer, som til tide glemmer at vande dem i en travl hverdag
6 FACTS WHY SEDUM PLANTS ARE THE BEST OPTION FOR EXTENSIVE GREEN ROOFS
Planting native plants can in some situations be done successfully. But selecting and obtaining the right plants can be difficult and time consuming. Often, even if such plants are properly identified and available in the marketplace, they struggle in the harsh conditions on the roof. Even in a garden at grade, using native plants to improve ecological function and provide habitat, it is not simply a matter of choosing a few natives and adding them to the plant list.
Further, wide variety of plant species on the roofs usually require deeper growing medium, which contributes to the weight load. Often, building statics inhibits such load, which consequently leads to less green roofs.
Vegetation on green roofs must be adapted to the harsh environment on the roof. Extensive green roofs usually have thin, coarse mineral-based growing medium and are planted primarily with sedums and other tough, drought-resistant, low growing plants. Such plants are in most cases commercially available, easy to install and likely to survive if given the proper attention during the establishment period. Plants will spread and provide the vegetated cover necessary for optimal roof performance.
1. Climate adaptable: Many Sedum species are found in the northern hemisphere and particularly in the Mediterranean, but also in North Africa and South America, for instance, where Sedum is often found in dry and/or cold areas where water can be scarce. Sedum can store water in its leaves and is able to endure varying weather conditions (from -25°C and up to 40°C).
2. Low growing media requirement: Sedum has very shallow roots, which is necessary when the thickness of the growing media is limited, which is always the case on extensive green roofs. Suitability of low-growing Sedum species for use in extensive green roofs has been confirmed because of their superior survival in substrate layers as thin as 2 to 3 cm
3. Modified metabolism: At night sedum absorbs carbon dioxide and turns it into malic acid, which is used during the day for photosynthesis. The pores in the leaves only open at night, to minimize the loss of moisture during the hot, dry day.
4. High disease tolerant: There is also little or no incidence of disease or insect infestation in Sedum.
5. Low water requirement: Sedum is drought resistant and requires relatively little nourishment and maintenance as compared to other types of plants. While other species die from drought, Sedum is able to survive by adjusting its metabolism and saving on water supply. Sedum can recover very quickly as soon as it receives some moisture.
6. Low maintenance requirement: As Sedum is able to survive by adjusting its metabolism saving on water, this means that it also saves a lot on the food side. In general adding nutrients once per year is sufficient, but adding it 2 times, the Sedum will flourish.
Sedum and a Sedum roof
The metabolism of Sedum differs from other plants. At night, carbon dioxide is absorbed through the stomata and converted into malic acid. During the day, under the influence of sunlight, the malic acid is decomposed and photosynthesis takes place. The stomata in the leaves are only open at night. During the hot and dry day, moisture loss is minimized.
1. Sedum has very shallow roots, a key requirement for an extensive green roof, considering the modest depth of the substrate layer.
2. Sedum is a lightweight method to create a green roof, thanks to the modest substrate layer depth.
3. Sedum can withstand drought, for example in very hot summers.
4. Sedum is easy to maintain and requires little water and nutrients.
5. Sedum is very resilient to diseases and insects pests.
6. Sedum has great adaptability under extreme weather conditions.