How do you start this flower from seeds?
These can be a bit tedious to start from seed, but with a little know how, you can do it. They will need a warm period followed by a cool period in order to germinate. This article will give you more information: https://www.gardeningknowhow.com/ornamental/flowers/sea-holly/sea-holly-flowers.htm
Friend sharing sea holly but I can't find any info on it. I have three cuttings that are not rooting. Can I try flower heads and extract seeds from that? thanks in advance
As long as the seed head has dried, and you know that the seeds are mature then they will grow from seed. There is a stratification process, too. This article will help: https://www.gardeningknowhow.com/ornamental/flowers/sea-holly/sea-holly-flowers.htm
I do next year. The rest of the plant did great, good color lots of leaves and by the way I started plant from seed in spring. It also has some new shoots starting.
It will be best to use an insecticide. These articles will help:
https://www.gardeningknowhow.com/special/organic/what-are-organic-pesticides.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides
This article will help you with the care of the plant:
https://www.gardeningknowhow.com/ornamental/flowers/sea-holly/sea-holly-flowers.htm
Planted 2 last summer and they were beautiful but over the winter both broke off at the root.
These plants have a long taproot, so unless there has been some damage to the root, you should see these plants begin to grow again soon. Here's an informative article: https://www.gardeningknowhow.com/ornamental/flowers/sea-holly/sea-holly-flowers.htm
It arrived in a bag of dirt with the roots partially separated and it hasn't grown any new growth in over a month that I've had it. It gets full sun & I only water it when the soil is dry. Please help to see if there's anything I can do to help it grow? My stepdaughter gave it to me 💗. I live in Danville, Alabama. Kind Regards, Marianne
Unfortunately, this looks to have been injured too heavily to continue living. It looks to have sustained quite a bit of root damage. The only thing that you could do would be work a deal out with the grower for replacement. The only thing that I can do is offer information for you to care for this plant, properly, once resolved.
https://www.gardeningknowhow.com/ornamental/flowers/sea-holly/sea-holly-flowers.htm
No sign of any blooms
There are a few reasons why this could be the case. It may not be old enough: They will not flower during the first, and sometimes second year.
They are too compact: This is one of the reasons that I believe that the plant is not flowering. This plant has a long taproot and will not be suited for container life. Unfortunately, they do not transplant well, either.
Too much nutrients: This plant thrives in poor, sandy soils. Nutrient rich soils will cause stretchiness and no flowering.
Too much moisture: These plants cannot tolerate wet or compact soils, at all.
This article will give you more information on the requirements of Eryngium:
https://www.gardeningknowhow.com/ornamental/flowers/sea-holly/sea-holly-flowers.htm