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They are finding that problem in Iceland where the North American lupin was introduced and is now spreading rapidly. It does look very pretty but it is wiping out the indigenous plant population. Attempts to eradicate it is taking a long time as even though plants are pulled out or destroyed by weed killers, seeds in the soil keep germinating.
Good table Eleanor , interesting fact did you know that in 1959 North American Arctic Lupin Seeds were discovered that were some 10,000 years old. They were planted and grew successfully.
It depends what the seeds are. Viability varies a lot as can be seen in this table.
Poppy seeds are supposed to remain vialble for over 100 years. 10-15 years ago I was given some Verbascum seedlings. They produced very pretty plants but I discovered they self set everywhere. They were all pulled out as were those in neighbouring gardens. The seeds still keep germinating and still get pulled out….
Bear in mind, with most seeds you can’t keep them forever, they have around a 2 year shelf life before they won’t germinate at all.
I still have a packet from last years offering. Last years appear to have self-seeded well so I probably wont be using them this year. I’ll keep them for next year when I might have a bit more space for planting….
Thanks Grey-Wolf – these will be great for the community garden which our residents association have.
.38 degrees website offering packets of free wild flower seeds ( no P&P to pay) enough to cover 4 square metres of garden, pots, tubs, windowboxes etc. to help out this year’s bumble bees. To get yours simply give your postal details on the link below:https://speakout.38degrees.org.uk/surveys/418