Yeeeees .... I almost forgot about that ...
Well if the content of the box , which Galadriel gave to Sam , made things grow faster and healthier , why not say they didn`t have to put too much of a work in to the growing of plants
And I did not mean hat the Elves of Lorien had such heavy equipment and they lived in hasey style . They might have done things like that with a hoe (it doesn`t even have to be made of mithril , gold or silver could do aswell

) . But the point is - they had to do some work like this to keep their flower gardens , at the least , in some order , so why not grow some veggies aswell ?
And besides , even if they did trade with other elves , where did these other Elves get the products to trade . I tend to think they grew it all . So if others can do that , howcome you do not like the idea of Lorien Elves growing plants to survive ?
-Ophelia-