Growing from Seed. They will germinate in 7-10 days. Feed Petunias in pots every other week using a balanced liquid fertilizer like 8-8-8 or 10-10-10. Sow your Wave petunia seed into a moistened germination media or potting soil. Make the transition to outdoors easier for your Double Wave petunias by placing the . Petunias are moderately easy to grow from seed, and extremely easy to grow from commercially grown seedlings. Popular. Expect around 12 weeks from seed sowing to flowering. It's most common to purchase young petunia plants from a nursery. If you are going to grow petunias from seed, start the seeds indoors 8 to 10 weeks before your last spring frost date. Growing a black petunia flower is fairly easy once you understand the requirements for the type of plant. That is a full month ahead of starting most vegetable seeds, but so important. Germination should occur in about ten days. - Black Petunia Flower Soil Conditions It takes 10 to 12 weeks after planting the seeds indoors for the seedlings to be large enough to plant outdoors. Grow on the dry side, but don't let the plants wilt. You can plant one petunia plant in a 4-inch container, or plant up to four petunias in a 10- to 12-inch container. Young plants not yet in bloom often settle in faster. Annuals. Make a clean cut uing a pair of sharp clippers or scissors. Cut stems approximately 3 inches in length. These conditions are significant to grow wild petunia. 3. So, it is heavy duty and may be used indoors or outdoors. These cottage garden and hanging basket favorites thrive in warm weather. Category: Ornamental Plants & Flowers. Answer: Petunias should be planted in the garden after the danger of frost is past. Sow petunia seeds indoors about 10 weeks before the intended outdoor planting date. Step 4. Start your seeds at least 10 to 12 weeks before your zone's projected last frost date. Plant young petunias outdoors after your last spring frost date, but keep a close eye on the weather forecast and protect young plants from late frosts. Fertilizing Petunias in Pots. The ruellia sun or shade means they require both conditions. 2) Gently press the soil around the roots to ensure there are no air pockets. There is an incredible range of colours and Suttons offer a great selection. There are red petunias, blue cultivars, white varieties, and combinations of all of the above. Normally, a petunia plant starts to exist from a seed within 10 to 12 days from planting the seeds. Pinch off the petunia leaves on the bottom 1-½ inches of the stem. If you start them from seed, start them indoors at least 10 to 12 weeks before the spring planting date. They can grow perennially only in the warmest corners of the United States (USDA zones 10 and 11). If you want more Wild Petunias in your outdoor space or in indoor containers, know that propagating these plants is really easy. Before planting, check the seed packet or our Growing Guide for individual planting instructions. If starting the seeds early, it is ideal to germinate the seeds indoors in a warm place using bottom heat more than . The main problem people find with growing petunias is in the size of the seeds. This forum is meant to cover issues involved in growing plants from seed, such as maintenance of proper conditions, recommendations for selections, sources for seeds, etc. blueberry143. When large enough to handle, prick out plants individually into cell trays or small pots and grow on at a temperature of 50-65°F (10-15°C) in good light. Latest. However, growing petunias in pots, regardless of their type, should not disappoint you, as long as you treat them right. How To Grow Hanging Baskets From Seed. Flower seed packets rarely list estimated days to maturity, but most annual flowers need about 95 days from seed to flower. Growing Petunias from Seed. The plants tolerate full sun when established, but must be protected from direct sun and high heat when small. It's best to buy transplants and plant them in light, well-drained soil in full sun after the last spring frost. Vertical fence gardens are ideal for small yards with limited…. Photo by Kristine Lofgren. B. Gently cover the seed with soil. Place the fluorescent light approximately 3 . When the seedlings are a few inches tall, acclimate them to the outdoors by hardening them off. Here is how you grow petunias from seed: 1. (Petunias should be planted outdoors after the danger of frost is past.) Petunias need to be started from seed around 10-12 weeks before you want to plant them outdoors. Petunias are heavy feeders, and we recommend keeping up with a regular fertilizing schedule to promote healthy growth and plentiful blooms. Petunias are tender perennials in Zones 9-11 but are typically grown as annuals in all zones. Seeds are planted too deep: We list this problem first, because many seeds end up too deep in the soil, and never see the light of day. A thin layer of soil over the seeds puts down the risk of mold. Do not cover the seeds. Gently lay 3-5 seeds on the top of the moisten soil {or Jiffy pellets} and lightly press the seeds into the soil. Watch for the seeds to sprout. How to Grow Petunias From Seed . Petunias are often a gardener's staple. Fluorescent lights are suitable for a light source, both for germination and for growing on. There is a bit of trepidation about growing petunias from seed, with most gardeners preferring to buy small plug plants and grow these on but with a little bit of knowledge and some patience, petunias are no more difficult to grow than any other flowers. Resist the urge to cover the seeds with soil, petunia seeds need light to germinate. When planting petunias in containers, be sure not to crowd your plants, limiting yourself to three per 12-inch (30 cm.) Petunia seeds are tiny so take care when handling, use a fine seed sower to make things easier. Tips for After Deadheading Petunias. If your petunias start to flag or grow leggy, cut them back and fertilize them. Next, use a garden fork to loosen the top 8-10 inches of soil, then spread 2-3 inches of peat moss, and add 2 pounds of a balanced fertilizer per 100 square feet of soil. Settle it well all over the pot. It is really easy to adjust spaces between tiers. If you're planting petunias in containers, use a soil-less mix. Keep the soil moist by watering the seeds from below so the seeds are not disturbed. How to plant petunia seedlings in window boxes. Growing Warm-Season Annuals. Germinating Petunias Fill a planting tray with damp potting soil. I repeat DO NOT COVER YOUR SEEDS WITH SOIL! Put the pot in a sunny window, and add a grow light to supplement the available sunlight throughout the shorter days of winter. FAQ. Just remove any blossoms and dead leaves. Milliflora produces masses of flowers on mini plants. HOW TO GROW PETUNIA FROM SEED. Most trailing petunias and other cultivars will be better for propagation via cuttings. The annual or bedding petunias can be grown from seed sown indoors with warmth in spring in cell trays, seed trays or small pots at a temperature of 18-24°C (65-75°F). Sowing in seed trays. However, petunias can also be started indoors in late winter. The very fine dust-like seed of petunias require light for germination. Do not plant the leaves. Sow petunia seeds in a growing medium indoors 10-12 weeks before planting outdoors. Petunias are a garden favorite with their non-stop blooms in a wide range of colors and their simple needs. Though petunias are quite easy to grow outdoors from transplants, amateur gardeners may find it difficult to grow them indoors. Question: When can petunias be planted outdoors? Black petunia plants should be acclimated to outdoor growing when started indoors. To grow petunias, start in the early spring by picking an area with well-draining soil that gets at least 5-6 hours of full sunlight a day. As soon as temperatures drop to freezing (32 degrees Fahrenheit), garden petunias die. Sow your Wave petunia seed into a moistened germination media or potting soil. Planting You can grow petunias from seeds, but it is easier to grow them from transplants. The plant may need water more often during particularly dry or hot periods. Sowing petunias. The container needs to have drainage holes in the bottom. GROW . Leggy, thin plants are slow to adjust to outdoor conditions. are considered an annual garden flower, but they are really a tender perennial winter hardy in U.S. Department of Agriculture plant hardiness zones 10 and 11. Featured. The advantages of starting petunias indoors are that you have a wider choice of varieties from which to choose, and you can raise large quantities of plants for less money. Place the seeding flat in a tray with a half inch of water, and cover the tray with clear plastic. If you grow petunias from seed, start them eight to 10 weeks before planting in beds. Begonias need light to germinate, so simply broadcast the seeds across the surface of the potting mix and press them against the surface of the soil with your fingertips or a flat piece of cardboard. 2. Spread: 18 inches to 4 feet. To find out which location is best for petunias from May, see our article on growing petunias. In spring and summer, take cuttings of 2-3 inches (5-8 cm) long with 2-3 knots and place them in moist sand with peat. Petunias in pots can be left outdoors for the winter in warm areas, like zones 9 through 11. There is a bit of trepidation about growing petunias from seed, with most gardeners preferring to buy small plug plants and grow these on but with a little bit of knowledge and some patience, petunias are no more difficult to grow than any other flowers. Keep the soil moist by watering the seeds from below so the seeds are not disturbed. Growing From Cuttings. Seedlings may bloom six to 10 weeks from planting into a pot, hanging basket or garden bed. Fluorescent lights are suitable for a light source, both for germination and for growing on. If you are going to grow petunias from seed, start the seeds indoors 8 to 10 weeks before your last spring frost date. Keep the soil moist, checking daily. You should provide adequate sunlight and moisture to the seeds, for the seeds to germinate. Whether you start them from seeds indoors eight to 10 weeks before your average last frost date, or purchase transplants from a nursery, outside of Zones 9 to 11, you must wait for reliably warm weather before planting petunias out. Those with smaller blooms but numerous flowers called Multiflora. ( See your local frost dates .) Then remove all leaves from the lower half of the stem. Then sprinkle on more mix until the seeds are barely covered. Most gardeners buy petunias at their local garden center or greenhouse in spring. 2. Plant young petunias outdoors after your last spring frost date, but keep a close eye on the weather forecast and protect young plants from late frosts. While the process is not fool-proof, the risks such as low-quality growing medium and excess humidity are factors that you'll face even if you propagate petunias from seeds. If you use a larger container, give each plant about a 4-square-inches space. If you are using pruning shears, clean them after each use. Plant petunias either as seedlings or start from seeds. Plant your petunias outdoors after the last frost date when the soil is warm enough, at least 60 degrees F in the spring. Fast, carefree growth is a virtue, starting with short germination times. The main problem people find with growing petunias is in the size of the seeds. Starting petunia seeds indoors 8 to 10 weeks before the last frost date in your area is the best way to grow petunias from seed. In fact, cuttings of wave petunias stuck into dirt, watered, and receiving sufficient heat (50-60˚F) will sprout roots in 7-10 days. It's usually safe to begin planting petunias in late April in southern Iowa and mid-May in northern parts of the state. Take cuttings from existing petunia plants and encourage them to grow roots. The pots will need to be moved to an indoor area that can offer some protection in all other zones. You'll save money because of the sheer number of plants you need, plus you'll have a much wider . Petunias benefit from light for best germination, therefore do not cover the seeds. Getting the potted plants out of cold temperatures and into a basement or garage can protect the roots so that the plants will grow again in the spring. As a result, most gardeners treat petunias ( Petunia x hybrida ) like annuals and replace them every year.However, you can ensure your petunias grow back after the winter by bringing them indoors or propagating . Sow petunia seeds from January to April. And they are very slow to germinate, which I find very stressful. Place the pots in a warm area that receives bright, indirect light. If you buy nursery transplants, choose small, compact plants. They grow in beds, borders, containers, and hanging baskets and do well whether started from seed or transplants. Sow the seeds thinly in trays of seed compost, water the compost before placing the seeds in the tray as watering after may wash the seeds away. Petunias are frost-sensitive, so avoid planting them out in the garden until all threat of frost has passed. Here are the steps for planting petunias . Petunias are plants that are loved by plant breeders and new types of petunia varieties are constantly being trialled. And lastly, Wave Petunias are the trailing or spreading variety. Although petunias are easy to grow outdoors from transplants, they may prove more challenging for beginning gardeners to start from seed. and mounding to heights of up to 2 feet! Pelleted or plain, sow petunia seeds by gently pressing them into moist seed-starting mix. There's a real sense of satisfaction in growing your own show-stopping display of petunias from seed. Once your seed trays are filled with sterile potting mix, it's time to plant your begonia seeds. 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