(I am not linked to this site in any way)
I was reading about how to improve yield of plants such as carrots that grow underground (known as root crops), and aside from regular stuff about maintaining the required supply of different nutrients in the soil through rotation, I came across this site (on a forum, there were a couple of people recommending this site, so thought I will pass it on).
The site is called Gardens Alive and this specific page is about the Root Crops fertilizer (link to site).
From the site:

Root crops- such as onions, beets, carrots, potatoes and turnips- need the support of soil that’s rich in potassium and phosphorus. So we’ve packed Root Crops Alive! with these essential nutrients in just the right balance needed by root crops. And, unlike greensand-based fertilizers, the potassium in Root Crops Alive! is plant-based, so root crops benefit immediately.
Apply 2-3 lbs. per 100 sq. ft. when you prepare the soil, or side-dress when plants emerge to get greater coverage per pound. For best results, feed again in midseason.

I do not recommend or dismiss this item, just read about it and thought I will pass it along.

Here is a great blog with some good links. People use kitchen gardens either as a hobby, to feel some closeness with nature, to get some food that they are sure is free from chemicals, or generally to supplement their grocery purchases with some self-grown vegetables. This blog (link) talks more about self-sufficiency through the purpose of a garden.
As a result, you learn more about how to grow a garden more suited for growing more food (in these times of recession, would you rather have a garden with a large extent of green lawn, or the same space being used for growing vegetables? – a lawn might look more aesthetic, but a garden built on the process of self-sufficiency would be more useful). You read the whole research paper on this subject, built around efforts in Melbourne. Here are some extracts from the article:

Community food security has emerged as a key response to broader environmental and socio-political issues. This research paper explores an important aspect – the ability of community members in the metropolitan Melbourne area to grow their own food and beneficial herbs, plants of self-sufficiency or productive value, while practicing sustainable gardening methods.
The research found a large majority of respondents believed there were increasing community trends toward self sufficient gardening and sustainable gardening. The research findings discovered substantial evidence of diverse educational opportunities. It found confirmation on communal and individual benefits of self-sufficient gardening, and some setbacks to healthy growth in Melbourne’s gardens.

If you are interested in getting Calla Lilies for your garden, and are unable to get some friends or a neighboring garden to get you bulbs, then you may consider growing these White beautiful Lilies from seed. Here’s a complete article that describes how to grow the Lilies from seed (link). Here are some extracts from the article:

Before even thinking about planting the calla lily seeds one needs to sort out the best ones by pregrowing them a little. This is done simply by placing a folded damp paper towel on a plate and then spread out the seeds upon it.
There are a lot of reasons not to plant the seed straight out in the garden among birds and mice, there are a lot of dangers still out there for a little seed so the best thing is to preplant it in a small pot so it can grow strong and healthy in peace.

Read the rest of the article at the original link.