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Liquid seaweed

I keep hearing about seaweed as a plant feed... I've come across liquid seaweed concentrate suggested to be diluted as a foliar spray.
1- would my hostas, ferns and other leafy plants benefit from this?
2- What other plants would benefit? I have an allotment so am thinking vegetable plants as well as garden plants.
3- Does it have a shelf life? As it is over £10 and recommended to be diluted 1 part to ten, i need to know I will get good use of it this season if it needs to be used within a given time.


  • Pete.8Pete.8 Posts: 11,288
    I use it every year as both a foliar supplement and a root drench.
    It's not really a fertilizer as such, but it does provide all the trace minerals that most plants benefit from. No point in using it as a foliar feed on anything with glossy leaves though as it just runs off.
    Most plants will benefit from it.
    Being organic it will have a shelf-life. I've just had a look at the 10L bottle I have of Maxicrop seaweed extract - there are no dates on it.
    I use it about every 3 weeks during the growing season, but not at the same time as any other liquid feed if applying as a root drench - leave it a couple of days.

    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • Zoomer44Zoomer44 Posts: 3,267
    I make it from seaweed washed up on the beach. Salt isn't a problem. It gets used instead of tomato feed and as a spray on leaves.

    I agree all your leafy plants will benefit. The seaweed left from making the plant brew goes into sweetcorn and mini pop trenches also potato trenches before planting. 

    I've used it straight from the beach as a mulch in pots, it deters slugs because of the salt and it can be used as a mulch around most plants and used weekly doesn't seem to upset te plants. 


  • UpNorthUpNorth Posts: 376
    Zoomer44 said:
    Salt isn't a problem. 

    really?   i thought they added salt to sand bags for patio/block paving, to try and prevent weeds.   are you saying the output you have doesn't have any salt in it, or literally that you water plants with salty water?   maybe the salt isn't in sufficient quantity to cause any trouble?
  • thanks for all your comments, very useful! I've decided to go for it and order some... sounds like it'll be well used before it goes out of date!
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