so that the organic material covers all the pot evenly. So I’ve never stopped reading gardening books. Seeds are sown in potting mix, and tray is on a heat mat (which gives a boost of around 10 degrees). Next put on it a thin layer of decomposed organic material, such as wood compost, leaf compost or maybe peat moss. I found some incredible reads that taught me so much and made me realize how much I didn’t know. I spent almost the entire winter of 2008/2009 reading up on gardening. Petunia seeds are notoriously slow to germinate if it weren’t for a few gardening books I picked up years ago. The first week of June is a safe bet for planting in most of the UK, therefore petunia seeds are best sown from March. How can that be? And since I happen to have a flat of them growing in a sunny window in my family room right now, I thought this would be the perfect time to tell you how insanely easy petunias are to start from seed. If you want early summer colour and good-sized, bushy petunia plants that are ready to plant out after the last frosts in May/June, then you should sow petunia seeds 12 weeks ahead of your expected last frost. For pots and containers, petunias do best in peat-free, multi-purpose potting compost. This hardening off process toughens the plant’s cell structure and reduces transplant shock and scalding.I’ve been growing petunias from seed for years now and just noticed I don’t have a seed starting tutorial about them on the blog. In borders, prepare the soil by mixing in plenty of well-rotted compost or soil conditioner, in advance of planting. If frost threatens at night, cover or bring containers indoors, then take them out again in the morning. Be sure to protect them from wind and hot sun at first.
Accustom young plants to outdoor conditions by moving them to a sheltered place outside for a week.
Before planting in the garden, seedling plants need to be “hardened off”.Sow petunia seeds indoors about 10 weeks before the intended outdoor planting date. The best plants to start from seed indoors are those that tolerate having their roots disturbed and those that need a long growing season.
Planting petunia seeds indoors how to#
Transplant hardened-off seedlings to the garden after the frost. How to Start Petunias from Seed Indoors Timing.Seedlings do not need much fertilizer, feed when they are 3-4 weeks old using a starter solution (half strength of a complete indoor houseplant food) according to manufacturer’s directions. If transplanting outside, harden off seedlings into a partially shaded spot in the garden, or an equally moderate place indoors.Thin to one seedling per cell when they have two sets of leaves.Most plants require a dark period to grow, do not leave lights on for 24 hours. Incandescent bulbs will not work for this process because they will get too hot. Raise the lights as the plants grow taller. As soon as seedlings emerge, provide plenty of light on a sunny windowsill or grow seedlings 3-4 inches beneath fluorescent plant lights turned on 16 hours per day, off for 8 hours at night.Sow seeds thinly and barely press into seed starting formula.Sow petunia seeds indoors 8-10 weeks before last frost using a seed starting kit.Put the pot in a sunny window, and add a grow light to supplement the available sunlight throughout the shorter days of winter. Just remove any blossoms and dead leaves. Bring your plant inside as described in the section above, but don’t prune it. Petunias may be grown from seed sown early indoors and transplanted outside after frost, or from potted plants. Petunias need a lot of sun to grow actively.
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