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Growing Tithonia Seeds on a Heated Seed Mat

A couple of months ago I watched Monty plant Tithonia seeds in the little 'plugs' that expand in water.  I have tried growing Tithonia from seed before without success so thought I would try these plugs.  Additionally I was given a heated seed mat so carefully soaked the plugs, placed in a tray on the mat and planted the seeds.  How many germinated? Not one!  Last week I planted another batch so we shall see.  The seeds are on the mat in my greenhouse and over the early Bank Holiday it did get extremely hot in there so I wonder if the first lot of seeds got 'cooked'.  Any ideas for gaining success with the second batch?  Also, just how often and liberally should the plugs be watered?

Posts

  • NollieNollie Girona, Catalunya, Northen Spain.Posts: 5,677
    Hi Marilyn, see

    https://forum.gardenersworld.com/discussion/1013739/keeping-these-tithonia-seeds-alive#latest

    Total benign neglect, I didn’t expect any to survive - I think they need 25degC to germinate, so my kitchen must have been warm enough! Now hoping for some advice on how to keep them alive...
  • hogweedhogweed Central ScotlandPosts: 4,037
    I sowed mine back in the second week of April in an unheated greenhouse (check my location!). Got about 18 seedlings up and have just potted them now into 3 in pots. They are growing strongly and will be planted out in a few weeks. Don't know if they need a long growing season before they flower or not but fingers crossed. 
    'Optimism is the faith that leads to achievement' - Helen Keller
  • NollieNollie Girona, Catalunya, Northen Spain.Posts: 5,677
    That’s some achievement, @hogweed, so six to a pot, what size pot? 
  • GrannybeeGrannybee Sunny South EnglandPosts: 288
    I think Hogweed means 3 inch pots - so 18 pots altogether....
  • hogweedhogweed Central ScotlandPosts: 4,037
    Yes, I did mean each to a 9cm pot @Nollie. Here they are. 

    'Optimism is the faith that leads to achievement' - Helen Keller
  • hogweedhogweed Central ScotlandPosts: 4,037
    I have never grown them before and not sure how they will cope in Scotland. But you can’t fault a trier!🙏🏻
    'Optimism is the faith that leads to achievement' - Helen Keller
  • NollieNollie Girona, Catalunya, Northen Spain.Posts: 5,677
    They look fantastic, Hogweed. Ah yes, just got the inch thing!  Mine have a way to go yet.

    Maralyn, mine were just sown direct in a propagator seed tray, lid on, vents closed, watered once, put them on the end of the kitchen table then forgot about them. You could try putting your plugs in a similar propagator if you have one, put this on your heated mat (maybe in the house not the greenhouse?). I really have no idea to be honest, just this worked, unexpectedly, for me. 
  • It's funny that Hogweed, living in Scotland, has got the best results so, with that in mind, I planted yet more seeds in fairly deep seed trays and have just left them in the unheated (except by the sun!) greenhouse.  We'll see what happens and thank you!
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