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Growing stipa tenuissima from seed

Hi all,

I am new to growing grasses from seed but want to grow six roughly 30cm spread clumps of stipa tenuissima to include in a border.

My question is about seed numbers - I have seen some advice to grow several seeds to a pot and then plant out the whole pot, but some advice suggesting growing in a seed tray and pricking out individual plants to grow on before planting out. 

Would just one seed eventually make a 30cm clump (and if so would it take ages?!) or should I go down the multiple seeds to a pot route?

Any help greatly appreciated!
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  • owd potterowd potter Posts: 979
    Grew them last year from seed.
    I pricked them out individually and potted up. Planted out in Jun / Jul.
    I had a success rate of probably 60-70%. They made decent plants within the season.
    This is the seedlings at end of August.

    Just another day at the plant...
  • Wow thanks - I'm amazed they got so big in one season! 

    What sort of size did you let them get to before pricking out? Assume there are no seed leaves / true leaves to help you work out when the root size is reasonable?
  • owd potterowd potter Posts: 979
    I did not plant them out until beginning July ish as I was still completing the new bed. This is the best photo that I can find just after they were planted out, 07/07/19.
    You can just make out the small clumps of seedlings, probably about 150mm or so high at that time.
    They really kicked on once they were planted out as you can see from previous photo 6 weeks later.

    Just another day at the plant...
  • Fantastic thanks, that is really helpful. Fingers crossed mine do that well too!
  • Hi @lauragorman1

    I am growing stipa tenuissima from seed this year and have the exact same questions as you and I just can't find the answer!

    My seeds have germinated and they are individual little needles of grass.  I can't figure out whether each seedling will grow into one decent clump with the spread advertised on the packet, or whether I need to plant a number of seedlings together to achieve a clump? 

    Could you advise what happened with yours? How many seedlings did you need for a decent sized clump? 

    Thank you! 

  • KeenOnGreenKeenOnGreen Posts: 1,831
    If you start growing from seed now, they will probably not germinate.  They need a cold spell over Winter (stratification) in order to germinate successfully.  I never bother with how many seeds to plant per pot, as it is very difficult to separate individual seeds, due to the long filament attached to each one.

    I just grab a bunch of seed and put it into a pot, only lightly covered with soil.  I leave the pots outside all Winter, and usually have high germination rates.  Once you have some adult plants in your garden, you will never be rid of it, it is a prolific self-seeder, including in the tiniest of gaps.  Personally, I wouldn't bother to try and get them to germinate now, it's probably too late.

    I think one seed produces a small clump, but that's very difficult to tell.  I would plant 30-50 seeds for a really decent sized clump.  
  • CeresCeres Posts: 2,698
    According to my seed packet, they can be sown November to March indoors so you may as well plant the seeds now.
  • Pete.8Pete.8 Posts: 11,340
    I find that one single blade of ST turns into a small clump over a few months in good weather if they're happy. They get a bit wider and taller the following year.
    I bought and planted 3 plants a few years ago and they have self seeded all over the area. Not a problem as they're easy to pull out where not wanted

    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • owd potterowd potter Posts: 979
    Pete.8 said:
    I find that one single blade of ST turns into a small clump over a few months in good weather if they're happy. 
    Exactly. 
    better grown in lean or poorer soil otherwise they become too lush and flop
    Just another day at the plant...
  • LoxleyLoxley Posts: 5,698
    edited March 2021
    You could always take a short cut and buy ONE plant and divide it. You could get 6 from a single 9cm pot if you cut carefully, and bypass all the pricking out, potting on etc.
    "What is hateful to you, do not do to your neighbour". 
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