beefy said:
whats the purpose of boiling the water? could you just soak them in water? thats what i do with cypress tree seeds.
Hi Beefy,
Typically 'hard-coat' seeds require some form of stratification. This breaks down the hardcoat allowing moisture to penetrate and start the germinating. So you can either wait out the winter with some seeds, soak them to eternity (hardcoats are like that, they can sit for years), or nip them at the ends.
Well nipping them or scarifying them is not an option with big gorilla hands like mine! LOL, so I opt to go the easy route with the boiled water. The extreme variation in temps causes the seedcoat to expand and contract in such a way that it has no alternative but to germinate (if it is viable).
Don't get me wrong, not all seeds can take this sort of extreme handling. Some might even cook. I even found out that if a hardcoat seed has been treated with an acid dip, then the boiled water is like boiling them twice and they cook. I found this out the hard way! Most seed companies that sell hardcoat seeds usually pre-stratify by way of cold or by way of an acid dip (not sure of the product though)
But if the seeds are from your garden or a friends, chances are you would get a much better success rate with this method. I really get great results.
Morning Glory seeds are one of those, as well as Cannas and Hibiscus. I usually take my fingernail and if I am unable to cause any dent or movement to the 'coat' of the seed, then I do the boil method. If the seed seems pliable then I just use water or simply just plant them directly into soil.
Surprisingly a rose seed is a hardcoat, but because I leave mine out during the winter months they already become "cold stratified" so they sprout really well for me! Otherwise I would consider this method also for roses! It also kills bacteria too!
Ron :rose