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When a houseplant endures excess sunlight, the cellular regulation of the leaf will be working overtime. The transpirational rate will go through the roof to lubricate the process of photosynthesis, along with keeping the leaf hydrated from the sun. While a plant is subjected to long periods of direct sun, osmosis and drying soil are considerably sped up during this ordeal; some specimens are better equipped for the rays than others. Caputia tomentosa has a near-white appearance that lacks chlorophyll for lowered rates of photosynthesis, along with reflecting the sun's rays off from its body.
For specimens that originate from the rainforest or temperate floors, they won't be as tolerable for such exposure. Many specimens will sport a red under-sides to reflect the dappled rays back into its leaf, thus increasing the light-capturing efficiency. When they're subjected to harsh spring or summer rays, possibly accelerated by the glass or wet leaves, the cellular makeup of its leaves begin to fail and breakdown. Especially when coupled with reduced soil moisture, the plant will enter osmotic-stress, where it'll release a chemical called 'Dehydrin' to begin the total breakdown of the plant.
The first signs of stress will be noticed on the leaves; brown edges and yellowed halos will circulate the leaf's diameter, and in some cases, the plant may develop a white, bleached-out appearance, too. Higher rates of transpiration will lead to drying soil and development of wilting, thus becoming a serious issue that must be addressed immediately. Some species may 'jump the gun' where they'll wilt before a large amount of water is lost to lower the rates of transpiration and dehydration. Stunted growth is the last symptom to look out for. Because of the undesired environment, there'll be will a reluctance for new growth as juvenile tissue is more likely to scald, compared to the thick older leaves.
The list below comprises of specimens that can endure several hours of intense light, even though the summer when the sun is at its sharpest. Those who have an Asterix ' * ' by their names must be accompanied by moist soil to counteract the heightened risk of dehydration. The plants in bold are pet-friendly.
As mentioned above, if a plant endures too-damaged leaves and severe dehydration, the chance of survival is significantly reduced. This final section will discuss the five tips in which you can help the specimen's recovery process.
Once the steps are fulfilled, it's time to play the waiting game. Take a photo of the specimen on the day of treatment, and then again every few days - this way, you'll be able to see a clear development or decline without having to second-guess.
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