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Why are my larkspur (delphinium) becoming chlorotic?

Fargo, ND(Zone 4a)

I planted these a couple months ago and they were doing well. They filled out a bit, went into full bloom and seeded, and now they are yellowing. One stem turned yellow and then browned, almost if it had been directly sprayed with something. They have been getting plenty of rain and have well-drained soil with a slow release fertilizer mixed in. All the other new plants around them are performing nicely. What is going on with these?

Thumbnail by crayondoom Thumbnail by crayondoom Thumbnail by crayondoom
Ayrshire Scotland, United Kingdom

Hi crayondoom, you already have replies to this question on the Gardening Question Forum in-case you have not picked them up.

If you still require more info, get back to us and see how to help further.

Best Regards.

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