Some, such as Begonia maculata can hardly tolerate direct sunlight at all and will develop large brown areas on their leaves, or even entirely brown leaves as they are scorched by the sun. Those begonias wth more waxy leaves, such as Begonia semperflorens varieties are much more tolerant of direct sunlight, while Rex cultivars can tolerate a modest amount of direct sunlight.
If you think your begonia has brown leaves because of too much direct sunlight, check the lighting levels in your room on several days and at different times of the day. Check the care instructions for your particular begonia and try to match the amount of lighting that is ideal for your plant.
Too little light is almost as bad for most houseplants, so aim for a happy medium. I have a light meter app on my phone that uses the light sensor on my phone to take a reading of light levels near my begonias. I am able to get a quick indication of how bright the conditions are and move my plants closer or further away from the window as needed.
I also wrote an article outlining the light requirements of houseplants , so you can use this to judge whether your plants need more or less light. I find begonias to be really fussy when I first bring them home. Make sure to buy really healthy plants at the store, and transport your plants home carefully. When you get them home, try to provide ideal conditions, with temperature, lighting and humidity in the middle of their desired range.
Sometimes the roots of begonias are a little shocked after the stress of the move, and can be prone to root rot if overwatered for the first few weeks. Sometimes they can lose a few leaves, and it may take a month or two before new growth develops, but soon your begonia will be looking great again. Begonias seem to be very sensitive to temperature stress at both the lower and upper end of normal.
Both can result in brown leaves due to the death of part or all of the leaves. The lower temperature limit for begonias depends on the variety. Low temperatures cause direct damage to the plants and moderately low temperatures make overwatering problems much more likely. High temperatures cause rapid water loss from the foliage, causing wilting, brown leaf edges and tips, and even causes entire leaves to turn brown and fall off. Excess direct sunlight, or positioning your begonias neaxt to a heat source such as a hot air vent or fire appliance can cause major heat stress and brown leaves.
Begonias are not particularly resistant to disease, so this is definitely something you need to watch carefully for. Diseases will cause rapid development of brown or black leaves on begonias, wilting, and plant death. But begonia leaves turning brown is a common problem in all varieties of begonias.
This is an alarming situation you need to take quick action to solve the issue. Or you will lose a beautiful foliage plant. Overwatering, underwatering, nutrient deficiencies, low humidity, and pest infestation result in begonia leaves turning brown.
All these problems have simple solutions. First of all, you need to identify the cause then follow the solution given in this post. Because in this article, I will cover all the possible causes that can cause brown crispy leaves in begonia with their solutions. Watering is the main cause that turns beautiful begonia leaves into brown color.
Underwatered begonia loses the water stored in the leaves. Due to lack of water, the begonia leaves turn into brown color. Begonias need moist soil but they do not want soggy soil.
Therefore, try to avoid overwatering because overwatering results in soggy soil. Then the soil becomes unable to circulate fresh oxygen and due to lack of fresh air plant roots start rotting. Root fungus completely destroys the up-taking system of the plant and the plant becomes water-deficient and nutrient deficient.
Both these conditions turn green begonia leaves into yellow and brown crispy colors. To water begonias, you need to check the soil conditions. If the soil has good moisture, then wait until the top 2 inches get dry. Then give water from the top without wetting the plant leaves. This should be your regular watering routine. To water dehydrated begonia you need to immediately give moisture to plant roots. For that reason, bottom watering is the best option.
First of all, fill the sink with water and then put the plant in a water-filled sink without the bottom tray saucer. When water touches the bottom hole, the soil immediately starts absorbing water. This way the water quickly reaches the plant roots. After 5 minutes take the pot out of the sink and check the top few inches of the soil. If the top few inches are dry then give some water from the top. Your plant will shortly produce new beautiful fresh leaves.
But here you need to cut the brown crispy parts of the leaves to encourage new growth. Old brown leaves will not turn green again at any cost. Brown leaves mean that part of the plant leaves is dead. They are also called dead leaves.
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Avoid watering the begonia plants' foliage. Begonias with constantly wet leaves are susceptible to bacterial leafspot, which causes wilting and leaf loss. Increase shade. Move the begonia plants or plant a vine on a trellis, set up a shade cloth, or grow taller vegetation near the plants. Most begonia types, except for some hybrids, prefer partial shade.
Too much sunlight can lead to fading and wilting of the leaves, and continued excessive sunlight can cause the edges of the begonias' foliage to turn brown. Decrease watering so the begonias' soil dries out between watering sessions. Begonia plants do not like very wet soil, and too much soil moisture can cause the plants' roots to rot. Rex begonias are in a group of cultivated begonias that all include Begonia rex-culturum in their parentage.
Their scientific name is Begonia rex-culturum, but they are commonly called rex begonias. There are many varieties of this plant, and gardeners love them for their foliage, which ranges widely in color and shape. Leaves are wide and heart-shaped with blends of colors that can look like splashes, stripes or swirls of pink, purple, brown, silver and even shades of deep red.
The Missouri Botanical Garden describes rex begonias as high-maintenance plants that require a tricky balance of water, light and temperature.
Some cultivars need more water and more humidity than others, although misting is not typically recommended for rex begonias due to their tendency to develop powdery mildew. Take care to avoid overwatering and apply a balanced fertilizer in spring.
They appreciate less water in winter when they are dormant. According to Bloomscape , the most common cause of crisping leaves in a rex begonia is lack of water.
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