If the soil is too dry, it will not be able to support the weight of the leaves, which will cause them to wilt and fall off. The third and most important thing to remember is that you need to make sure that the plant is not over-watered. Most petunias will only return for about three years before they die. The petunia can be kept alive in a sunny spot by being treated as a house plant. The plant needs a lot of light to resist this. When the top of the soil starts to dry out, place the potted Petunia in a warm area that receives lots of bright sunlight and water. Petunias can be grown indoors as houseplants, but it can be tricky. Seedlings should be transplanted when they are 6 to 8 inches tall, but they can be kept in the ground for up to a year before transplanting. Keep the soil moist but not soggy, and allow the seedlings to grow until they reach a height of at least 6 inches. Sow seeds in spring or early summer, when the weather is warm, moist and sunny. When the seeds are barely covered, sprinkle on more mix. If you want to sow petunia seeds, gently press them into a moist seed-starting mix. What is the fastest way to germinate petunias? When the plant is a few weeks old, it is ready to be transplanted into the garden. The plants should also be kept moist, but not soggy, to prevent root rot and other diseases. If the soil is not well drained, the plants will not grow well. Plant the seedlings in a well-drained pot with good drainage. Adding some sharp horticultural sand, perlite or vermiculite to the potting mix will help improve drainage. If you want to grow bushy plants that can be planted out in late spring or early summer, sow in early spring. What is the best time to sow petunia seeds? If the flower buds are starting to form, you know your plant is growing well. You can also check to see if the plant has started to flower by looking at the flowers on the petiole (the part that connects the leaves to the stem). If it is larger than a quarter of an inch, it’s probably ready. The best way to tell if your seedling is ready to transplant is to check the size of the root ball. It takes 10 to 12 weeks before petunias are big enough to plant out, so they need to be started early in the spring in order to have the best chance of success. How long does it take to grow petunias from seeds? Do petunia seeds need heat to germinate?.What is the fastest way to germinate petunias?.What is the best time to sow petunia seeds?.How long does it take to grow petunias from seeds?.Now, if you're using a window box, or container, you'll need to mix timed-release fertilizer into the soil.When the season changes (early to mid-July) you'll want to give liquid fertilizer that's meant specially for flowering plants a try, at about every three weeks (although, weekly for spreading petunias). You'll want to do this at the rate of about two pounds per hundred square feet. Fertilize your soil by using a balanced fertilizer (like 8-8-8, 10-10-10, or 12-12-12) into your garden's soil.This can help break up heavy clay soil, allowing for better water drainage or increase the ability of sandy soil to hold nutrients and moisture. Incorporate the organic matter into the soil by using a garden fork to about the depth of eight to ten inches.You'll need to spread this organic matter about two to three inches (5.1-7.6 cm) thick. If you're planting in the garden, condition the soil with organic matter like baled peat moss, leaf compost, or well-rotted manure. You want to both condition the soil and fertilize it to make it ready for petunias. Make sure to dig the soil so that it is nice and loose (allowing for better drainage).
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