From this page you can find all awesome stuff that you can create with BIG OLD DOWN ARROW. You can find this item in furniture category. Plant 40, harvest 40, brake all the blocks, repeat. You get experiance points for breaking BIG OLD DOWN ARROW. How many times you need to hit it? Head to the wiki for more info: <a href="https://growtopia.fandom.com/wiki/Big_Old_Down_Arrow">big old down arrow</a> Seed mathematics is very complicated, but you should get at least 1 seed back from splicing BIG OLD DOWN ARROW. Will you strike it rich? You just have to count the gems yourself. Massproducing BIG OLD DOWN ARROW can be tricky. You will find out after you have harvested a few.