![]() ![]() Note also that home made compost, unless produced using a hot, aerobic composting method where it reaches very high temperatures during the process (difficult to achieve with home composting), is not suitable for use as a planting medium for either plants or seeds (especially in containers), but is useful as a soil conditioner on open ground outdoors.Petunia is an annual or perennial growing flower that comes in a variety of colors, sizes, and designs. Ordinary potting soil has a higher level of fertilizer which may deter germination or burn seed/seedlings, whereas seed starter has very little or no fertilizer. If you are in the southern hemisphere, it was too early, and it seems you did not use seed starting mix for the seeds either. If you are in the northern hemisphere,then you started too late trying to germinate from seed to have flowering plants this summer. Petunia seed sowing is similar - early in the year, 12 weeks before the last frost, in warm temperatures or on a heat mat, not covered because they need light to germinate, sown in seed starting soil, not ordinary potting mix. Further instructions on how to grow from seed here They should be sown into seed starting formula potting soil, not ordinary potting soil and not in homemade compost. In the northern hemisphere, Catharansus should be sown indoors early in the year, around 12 weeks prior to the last frost, in temperatures of around 76 deg F. However, since you do not wish to impart that information, here is a general answer. Where you are in the world is important for seed sowing, even if that takes place under cover or indoors. ![]() I am going to assume that the vinca you refer to is Catharansus since I don't know where you are in the world, it's impossible to know whether Vinca major/minor would be a perennial where you are, but Catharansus is usually grown as an annual and therefore might be raised from seed each year. I've taken water, bedding, light and temperature conditions into consideration.Īny idea on what may prevent them from germinating? Am I missing something here? ![]() It has been more than 5 weeks, and according to most information on the internet (and in seeds packages bought from the nursery) they we're supposed to germinate after 2-3 weeks.
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