A basic layout that’s both slightly seed-positive and yeilds between 40-180% crop is my farm. Which is also somewhat unoptimal because that makes it much easier to actually physically farm the crops - I just go down a row and mow everything down and replant.
The starberries are near-optimal for slightly seed+ and decent yields, but starberries are different because they need air blocks.
Someone posted a guide that shows the general area that affects a crop, optimized for seed yeild - Maximum Starberry Nerd Information but again if you want actual crops you’d want a setup more like mine.
The starberry part of the farm is aboveground and fairly easy to understand just from looking at the layouts, thorns in this pattern, specfic foliate type in that pattern, mold here and there, growth for the glossies ( I think it’s the glossies anyway 
)
If you have a question about what’s under the cover blocks on the ground crops you can ask - but basically they are a single like of half-blocks of the seed producing block, with water or lava filling the other half of the block (except for the goo - lava destroys growth, so they are on seperate sides. Also the goo isn’t seed-positive because it can’t be done, hence no promises to sell goo seeds). The Kranuts are alternating blocks of amber and compact iron topped with water - with the alternation reversed every row, for a slightly better yeild.
