I was going to write about Helianthus atrorubens ‘Monarch’ but I am now slightly concerned that my plant is not the true ‘Monarch’. I believe that the true plant has more than a single row of ray florets around the ‘flower’ and mine is more or less single. But in other ways it does seem to be correct. Helianthus atrorubens is named after the brown disc in the centre of the ‘flower’ and is native to woodlands in the SE USA. It is an invasive species and the plants grown are often hybrids involving H. pauciflorus.
The most common cultivars are ‘Gullick’s Variety’, ‘Monarch’ and ‘Miss Mellish’. All three seem to be confused and ‘Miss Mellish’ is often sold as ‘Gullick’s Variety’. I don’t feel I can be sure of what mine is unless I grew all three! ‘Gullick’s Variety’ should be 1.5m high with several rows of ray florets on flowers 12cm across. ‘Miss Mellish’ is 2m high with ‘flowers’ 10cm across. The ray florets are often twisted. ‘Monarch’ has flowers 15cm across and gets 2m high. It is notable for being invasive.
References I can find state that it has two rows of ray florets – or just one. What makes me slightly certain that I have the real thing is that it spreads like crazy and that the flowerheads are produced singly on the stems. My plant has stiff, slender stems that only produce four or five branches, well-spaced, with a single flowerhead.
My plant started last summer as a 1litre pot and is now a clump 1.2m across. It will have to be moved either next spring or a year later or it will take over the bed.
But, on the positive side, it has been self-supporting so far, even after a wet and windy week, and is making a bright splash of brazen yellow. The flowers are best appreciated by the birds since they are held horizontally and atop the 2m stems are hard to appreciate unless viewed from above.
The lack of posts this week has been, in part, because of business in the garden. We finally got the summerhouse up and painted. It is the main focus of part of the back garden which will be planted relatively simply – no helianthus ‘Monarch’ here (probably).
The ‘frames’ are made of spare skirting board and the lawn has been sown and I am pleased to say that the first shoots are appearing, six days after sowing.
All we need now is time to sit!