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Are these Heliopsis or Helianthus

homebirdhomebird Posts: 110

I am not sure even after looking at photos of each on line. They are very tall, 5ft, self supporting on wiry stems. The flowers are about 3 inches across and a rich yellow.imageimageimageThey spread readily by root growth.

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  • OnopordumOnopordum Posts: 390

    Not really familiar with Heliopsis but these look good for perennial Helianthus to me. Very good plants but they are vigorous and do spread quite a bit. Although they do seem to get too congested after a while and benefit from being divided in spring (around March) to reinvigorate them.

  • nutcutletnutcutlet PeterboroughPosts: 26,365

    are these flowering now in the UK?

  • Pete.8Pete.8 Billericay, EssexPosts: 8,492

    Heliopsis just coming into flower from seed I sowed in March-
    image

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • nutcutletnutcutlet PeterboroughPosts: 26,365

    I reckon that's it Pete, too early for helianthus. 

  • OnopordumOnopordum Posts: 390

    Having looked the difference it up I'm not convinced homebird's flower has the conical centre (receptacle) Heliopsis should have. e.g. see this table of differences: https://www.jstor.org/stable/2993714?seq=2#page_scan_tab_contents

    It's hard to tell though from the photo. Best thing to do would be to take apart one of the flowers to check the individual ray florets (the big yellow petals) to see if they contain female flower parts with a developing one-seeded fruit at the base, or if only the disc (inner) florets have female parts and seeds.

  • CilldaraCilldara Posts: 2

    image

    I'm stuck with this one.  

    Can anyone help please?

    It looks similar. 

    Flowers until September. 

    Photo taken last year in neighbouring garden. image

  • OnopordumOnopordum Posts: 390

    Cilldara's photo looks a better candidate for Heliopsis, with a more conical shape.

    I've just had a look at the perennial Helianthus here which has just started to flower. The ray florets do have what looks like a small ovary at the base, but no sign of a stigma. The stigmas on the disc florets are very obvious - protruding from the petals and curled back at the top.

  • CilldaraCilldara Posts: 2

    Thank you Onopordum. 

  • homebirdhomebird Posts: 110

    It looks to me like the Heliopsis have darker stems than the ones I have. They must be Helianthus. ?

  • homebirdhomebird Posts: 110

    I took some better photos this morning...imageimageimageimageThey were a gift from someone's garden, many years ago. 

    Last edited: 15 July 2017 10:55:59

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