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Saintpaulia, also known as the Usambara violet, is a very common houseplant. These are quite unpretentious plants, with proper care they bloom throughout the spring and summer season.
- Leaf age
- Lighting and watering
- The soil
- Top dressing
- Pests and diseases
Analyzing the causes of yellowing.
Often novice flower growers ask why the leaves of violets turn yellow? This can happen for a variety of reasons. First, it can be old, obsolete leaves, their yellowing is a natural process, just remove them.
Lighting and watering
Sunburn, overheating or overdrying may be another cause. In this case, you need to increase watering and shade the plant. When dry, the pot can be placed in warm water for an hour, and then the plant is placed in a shaded place. Sun-protective films for windows are very convenient, they allow the sun to illuminate the plant sufficiently and do not allow to burn. Also try to place violets with light leaves on the north or east window, and with dark ones on the west or south, covered with sunscreen.
Watering is carried out as the substrate dries out, preventing either drying out or excessive flooding. The waterlogged soil turns sour, aeration is sharply reduced, as a result of which the roots rot, the leaves turn yellow and lose turgor. It is better to clean the roots and transplant the saintpaulia.
Often the answer to the question of why the leaves of violets turn yellow lies in the composition of the substrate.
Try in the spring, before flowering, change the substrate to a new one specially designed for Saintpaulias.
The well-being of Saintpaulia is strongly influenced by the acidity of the soil. The easiest way to measure pH is to water the pot with distilled water and soak the indicator paper in whatever water seeps into the pan. The color change indicates the acidity of the substrate (pink - acidic reaction, blue - alkali). This is, of course, an approximate way, but fast.
If you do not use store-bought mixtures, take note that the land from under the linden and birch is suitable for Saintpaulias. Watering alder earrings with tinctures and sleeping tea is also useful for them. They immediately have a bright color of flowers. Coniferous and leafy soil, as well as iron additives, increase the acidity of the substrate, and ash or chalk alkalizes it. By periodically measuring the acidity, you can successfully regulate it in the required rates. The norm for Saintpaulias is 5.5-6.8.
At home, we recommend measuring the acidity like this: pour five teaspoons of the substrate with half a glass of a one percent solution of potassium chloride, mix and stand for a day. The next day, we moisten the indicator paper and determine the acidity of the soil using the scale on the pack.
A sufficient amount of nitrogen in the soil is very important for the formation of a plant, while phosphorus is needed for good flowering. Many novice flower growers actively feed the violet with phosphorus fertilizers, forgetting about nitrogen fertilizers. Fertilizer "Emerald" is specially developed for Saintpaulias, including it protects their leaves from yellowing. Try to use it.
A little about the regularity of dressings.
In December-February, a one-time feeding is needed; in April, May, September, October - 3 times; in June, July, August - 4 times a month.
Top dressing alternates - organic (mullein, bird droppings) and mineral fertilizers. Organic ones are prepared a week before feeding. Dry cow dung (100 g) is poured with a liter of water. After a few days, the infusion is filtered and diluted in three liters of water. The rest of the grounds can be diluted twice more with water, increasing the fermentation period.
Poultry droppings (also dry) are diluted with water (20 g per 3 l) and, having been infused for several days, are immediately used for feeding. Previously, saintpaulias are watered with plain water.
Pests and diseases
Saintpaulias often wither and their leaves die off if fungi, bacteria or pests appear.
If, after yellowing of the leaves, the base of the stem turns brownish and they soften, this indicates an excess of moisture and a low temperature. To eliminate the disease, it is necessary to debug the plant maintenance regime and replace the soil.
The appearance of light yellow spots on the plants may indicate the appearance of greenhouse thrips. These are sucking pests with a narrowish body 1-1.5 mm long. The color is brown, the larvae are yellowish. Spraying with tobacco infusion and dusting with pyrethrum is effective against thrips.
If white jumping trifles appear in the pots, these are puffs, or springtails. Their appearance signals signs of root decay. They are not dangerous in small quantities, as they eat up rotting remains. But a large amount can lead to eating healthy roots. They get rid of puffs by dusting the soil with pyrethrum, makhorka or crushed citrus peels.
So, we looked at the main causes of yellow leaves in violets, and gave some tips for caring for them. Now observe your beauties, if necessary, adjust the conditions of their growing, and they will be grateful to you.