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Anyone out there growing agastache? Black adder, sangria, blue fortune or alabaster.?

Hi I've just put a small stem with roots of 'black adder' in my garden, I'm not really familiar with this plant so will watch this thread with interest, it's not a native of the UK I have been led to understand and grows tall from what I've seen of it, are you able to expand on your question

I am keen to add to my collection of agastaches but am trying to find out which are invasive either by runners or seed, these I do not want. Black Adder is a lovely perennial growing to about 5 feet tall and quite narrow. Blue/black flowers and liquorice foliage. However, it is easily lost in winter so I will see if I can split it in autumn but at least I will pot it up to keep in greenhouse. Agastache Sangria is new to me but it is a lovely plant....again narrow and tallish.

Hi. I am interested in growing agastaches but am wondering how invasive they are. I have mixed border and do not want to plant anything that might run into adjoining plants so that I have to dig them up and replant. Any advice would be appreciated.

Hi lovetogarden. Black adder is well behaved so should be fine. Am looking into other agastaches now but the best thing is to grow those that should be ok but keep an eye on them at summer's end. I will dig mine up, look at the roots and pot up to protect over winter in the greenhouse. The agastaches are looking superb.......spikes of pink (sangria) and blue black (black adder)



Hi Christopher2.

I have ordered Black adder today and am looking forward to giving it a try. Yours sound lovely.

Thanks for your help.


Hi Christine. Hopefully you will have good size plant but I suspect it will be a small 9 cm pot so for next year really. What other plants do you like? I regard myself as a plantsman and like to put plants together etc. chris

Hi Chris.

I like anything and everything. I am getting together some plants for a border that has got out of hand and I want to completely revamp it in the autumn. I have Astrantia a deep red variety, Salvia flugens, dark blue and light blue(don't know their names) that I intend to keep, and some we have grown from seed, far too many, so they will no doubt find good homes, and at the moment that's about it, apart from various daffodils and snow drops. On the fence behind the border there's a golden jasmin, yellow honeysuckle and  The President clematis, a climbing rose, Ginger syllabub, also cerinthe that seeds all over, not that I mind that. From your earlier posts you say that agastache are a bit tender, so I will keep that in the greenhouse and plant out next spring. The border faces south and get the sun most of the day, the soil is light and has to be mulched to keep in the moisture, we usually are quite dry in the summer, this year is the exception as it is everywhere else.

The time has come to get in there and sort it out!.

I am open to suggestions, and would appreciate your thoughts. Thanks.


PS. it can get cold here in Lincolnshire we had -15c one night last year, it killed all the wisteria buds just as they were about to open and it was down to -18c the previous winter.

Hi Christine. My soil is light sandy loam and here in Cornwall frosts are not too common. Astrantias will wither away in dry soils....they need moisture. Nepeta,lavenders, santolinas (I grow a nice yellow foliage one) echinaceas, etc will do well but tender perennials, that I pot up in autumn, like blue salvias, cannas, should do well with you. You could fill spaces between shrubs with lots of cosmos....I have done a new border and planted white cosmos in drifts. I grow astrantias but in areas where the soil is rich and they are fantastic but Mediterranean type plants are ones to go for I think.. Because it is so mild here I grow osteospermum, crocosmia, and stuff that would be regarded as tender with you........?? What about Achilleas, sedums? Chris

Hi Chris.

I also grow cosmos to infill along with nicotiana lime green, I love it, astrantia,it does well in my shady part of the garden,thalictrum, and all sort of different perennials, along with old fashioned roses. I am always on the look out for something a bit different. I have also grown achilleas this year and they have done very well, in fact I have ordered some more along with the agastache. Looking forward to them arriving!! 

Thanks for your suggestions, I envy you your mild winters, we never know what to expect as we get cold east winds from the continent and that can play havoc with the garden..


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