Rake the patch which isn't 'trashed' then plant your seed.
Harvest the blindweed once grown (can take up to 5 minutes).
Speak to Captain Braindeath.
South-east corner, climb up the ladder.
North-west corner, use the blindweed on the hopper.
Talk to Captain Braindeath.
Go to the island to the north via the bridges north-west.
(wear your ring of charos to distract 50% Luke)
Up the mountain, use the bucket on the stagnant lake.
Use the bucket on the hopper (keep the empty bucket for later).
Return to Captain Braindeath. He will give you a net-tangled fishbowl, which you need to catch the sluglings. If you accidentally unwrap the net-tangled fishbowl, just use the bowl on the net to re-tangle them.