First of all, what is worth doing is removing wilted flowers so that the plant directs its energy to forming new buds. It is not necessary to do this daily, once a week is enough, and during the active flowering period – several times a week.
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It is important to remove not only dry petals but the entire flower with the stem, otherwise the plant will waste energy on seed development.
Cut the stems in half
If the petunia has stretched and looks sparse, it is worth decisively pruning the stems by about half. This may seem radical, but this is exactly how the plant is encouraged to grow new, denser, and looser foliage. New shoots may not appear immediately – sometimes you have to wait a week or two.
Check if there is enough sunlight
Petunias need at least 6 hours of sunlight daily. If trees or bushes have grown nearby and now block the flowers, it is worth trimming the branches or moving the pots to a place with more light.
Monitor watering
Petunias tolerate both overly dry and overly wet soil equally poorly. As summer progresses, the soil in pots dries out much faster, so sometimes plants need to be watered daily.
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If the soil has hardened and started to separate from the edges of the pot – this is a sign that the plant needs deep watering. In this case, the pot can be placed for 15 minutes in an uneven container with water until the top layer of soil becomes moist. If the soil is very compacted, it is better to repot the plant into fresh soil mixed with perlite for better drainage.
If the leaves are yellowing and the soil remains constantly wet – this is a sign of overwatering. Then the plant should be repotted into a pot with drainage holes and fresh soil, after checking the roots: soft, blackened, or parts emitting an unpleasant smell must be cut off.
Don’t forget fertilizing
Petunias are plants that need a lot of nutrients. If you have not fertilized them since planting, now is the time to fix that. Potted petunias should be fertilized with liquid fertilizer weekly, and those growing in open ground – once every 2 or 3 weeks.
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