Tag Archives: BlackNarcissus Dahlia

UPDATE -NDC Dahlia Cuttings 62.5% success rate

You may remember back in June how excited I was when my 24 new Dahlia Cuttings arrived from the National Dahlia Collection (NDC) in Penzance, UK:

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I was reluctant ast first to buy more Dahlia cuttings from NDC as back in 2015 I had problems with a number of cuttings from NDC (see previous blog post). I was hesitant to buy from them again, but last year I gave in and placed another order, as I struggled to find other alternative suppliers in the UK with as much variety.

So this year, I was really vigilant and made sure I gave the Dahlias the best possible start and regularly fertilised and watered throughout the growing season. However I only had a 62.5% success rate with 15/24 growing correctly. The problems I had are as follows:

Wrong dahlia cutting sent (x4):  Picture on the left is what it should look like, picture on the right is what I was actually sent.

  • Tartan – no white stripes, this actually looks more like a ‘Thomas Eddison Dahlia’

tartan-comparison-2016

  • Karma Fusciana – single dahlia instead

karma_fuchsiana-comparison-2016

  • Oakwood Naranga – right colour, completely different shape

Oakwood-naranga X comparison 2016.jpg

  • Dr John Grainger – right colour, completely different shape

Dr John Grainger.jpg

Diseased Dahlia’s x2 – i.e. didn’t flower and Crown/Leaf Gall found when tuber dug up: 

  • Black Narcissus
  • Clara May

Crown Gall is a bacterial disease that causes large abnormal growths at the base of the infected plant or the top of one or more tubers as shown in the picture below. The plants are stunted and the shoots spindly. Since there is no effective treatment, infected plants and tubers should be destroyed. I think the source of the bacteria is unlikely to reside in my garden as the area the dahlias are being grown is was turfed up until 18 months ago ago when we moved in. Turfing is one of the recommended ways of getting rid of the bacteria if its a problem where you live, so I am doubtful it was already in my garden. It is also VERY common in Dahlias, so I can only suspect the Mother stock was infected and passed to the cuttings. Though you can never be sure with bacteria and virus diseases.

crown-leafy-gall-2016

Dahlia’s which didn’t grow x3  – i.e. cutting wilted and died, no tuber: 

  • Wooton Phoebe
  • Pearsons Ben
  • Lupin Dixie

didnt-grow-2016

15x Dahlias that grew well

The remaining 15 Dahlias grew well as you can see from the catalogue photo (top) versus the photo I took (Bottom). The red dahlias in particular did very well.

dahlia-progress-2016c

dahlia-progress-2016b

I’m not convinced the Dahlia ‘Promise’ has the same leaf shape, but at least it grew well and was the same colour. Tohsuikyou, flowered well, however the flower heads were too heavy for the stems and consequently the flowers were often drooped over.

dahlia-progress-2016a

Nuit de ete didn’t grow well, it only flowered once briefly, so I’m hoping it comes back next year and performs better. Je-Maintendrai was a huge dinner plate dahlia, gorgeous but difficult to stake. Zurichlooked nothing like i expected and never did develop the deep orange colour shown on the NDC website. Rossendale Luke and Barbarry dominion were both stunning.

In summary I had a 62.5% success rate. I have read that its normal to lose some dahlias each year, but it’s difficult to know what percentage is normal. I had similar problems in previous years with both Taylors Bulbs and the National Dahlia collection (NDC) sending different coloured dahlias to the ones intended. I have contacted the NDC and they have agreed to investigate and replace the 4 dahlias which were the wrong colour.

In the meantime I have placed a new Dahlia order with ‘Eurodahlia’ and I will report back next year 🙂

Dahlias are worth growing though – when they are in full bloom – like my garden here – they look magnificent:

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