April was mostly spent upplanting seedlings into bigger containers as they outgrew the Chinese take-out trays.
(Does anyone want some Roma tomato seedlings? A spaghetti squash plant? jalapeno pepper seedlings? okra?)
Speaking of okra, I bought a packet of okra seeds on whim. I also (It was May, but if I wait, I'll forget) bought $3.23 of humus/manure mix. Sunday, I repotted my biggest tomato seedling into a homemade kitty-litter pail self-watering planter, and the biggest spaghetti squash seedling into the leftover kitty-litter pail.
Guesstimating $1 of electricity spent on my grow lamp for each month, $5.00 on spent on seeds and $11.23 on dirt, I've spent $18.23 so far and netted nothing but entertainment.
Edited to add: Yes. To be honest, I'm doing this for the good feelings it generates. Please don't read the above comment to think I'm disappointed in the lack of yield in my garden. I's the 6th of May! I don't expect there to be anything in my garden yet but the fun of digging in the dirt! But please note that this set of posts is about the financial costs and gains of the garden, not the spiritual and emotional well-being it generates in me. :-P
See also this post.