I planted a few different types of seeds last week (Lupins, dahlias, coleus, French Lavender and petunias) and petunias are the only ones that have not started germinating yet. Is it because they were in pellets or are petunias just slow to get going?

YEs the coating has to. Break down so they usually take more time.
I spray water over them and keep the cover on the tray.....to keep them slightly more moist.

According to my seed pack they take 2 to 3 weeks to germinate if there is adequate humidity. If you are in a dry climate you might want to propagate in sealed plastic bag.

Thanks, I'm just being impatient! The packet says 10 - 21 days but so does the Lupins and they were up on day 2! The humidity is good...I have them in pots with cling film covering them and there's plenty of condensation on the film. I'm sure there'll be life soon

CarolineScott said:YEs the coating has to. Break down so they usually take more time.
I spray water over them and keep the cover on the tray.....to keep them slightly more moist.

I agree. That's been my experience, too.

Karen

My petunias are consistently up in 5 days, and if they aren't germinated by day 7 it's rare to have them appear after that.

I'm trying to figure out a way to make pelleted seed last longer than a year. I have unpelleted seeds last for years, sometimes 4 or 5. If they're pelleted, by year 2 they're down to 20% success.