Garden / June 19, 2018 / .
A raised bed is ideally 18 - 24 inches deep, but if you are building your raised beds on top of existing earth you wilI have some leeway here. I have successfully gardened in boxes built over earth with only one foot of soil depth. You can find both detailed instructions for building a raised beds and multiple choices for buying raised beds here.
Most seeds and seedlings will tell you the mature size of the plants you are selecting. Knowing that, you can space things out and see just how much you can fit into your space. More likely however, you will do what most gardeners do and squeeze in as many seedlings as you can fit into your garden, then deal with the crowding later.
Small-space gardening can have a few challenges: The space may shaded by walls or adjacent structures. There is often little actual ground exposed—much of the space is hardscaped with patios or on a balcony for example. Sometimes there is no water source. Sometimes drainage is poor. And, in particular in multi-family dwellings, such as apartment homes and condos, there is often a lack of privacy in these outdoor spaces.
Without regular water, vegetables will not fill out and some, like tomatoes, will crack open if suddenly plumped up with water after struggling without for awhile. You can not always rely on rain. If you have the means, a drip irrigation system is a definite plus for a vegetable garden. The new component systems are really quite easy to install and cost a lot less than most people think. And you will save money on water, because it goes directly to the plants roots. Less is lost to evaporation.