An office garden provides a space for relaxing between hectic projects, even if the garden is just a planter or two. If there's room, add a bench. Before tackling an outside garden, make sure you have the landlord's permission. Office buildings are often under contract for landscaping maintenance. You may not be allowed to change the garden. If that's the case, create an inside office garden with planters and containers.
Choose an area for the garden. If it's outside, check if it's in shade for most of the day or get lots of sun. If it's inside, know how much sun the area gets or figure out if you could use grow lights. How much light it gets determines which plants you can use. For example, a space outside which receives at least six hours of sun could have flowers like roses, daisies and petunias.
Figure out how much time for maintenance and who will care for the garden. Some plants, like cacti, don't require much work once they're planted. They would be appropriate for an indoor office garden by a sunny window. Others, like orchids, seem to require lots of care but actually don't once their requirements of heat and humidity are met. They would do well in a glass terrarium garden in the office.
Consider logistical problems, such as how to get the plants into the area and how to water them. If the office is on an upper floor it may not be feasible to have large planters brought in because of the weight. If the only water is in a restroom, plan for plants in containers. Plan to place the containers in larger planters with sphagnum moss to minimize watering.
Set budget for the garden that includes not only the cost of the plants, but the cost of installing the garden if outside or the cost of soil, grow lights and potting soil if inside.
Sketch out the garden to scale, noting where each plant should go. Keep in mind the mature size of the plants. Fill in with annuals or, if the garden is inside, indoor plants. This will keep the area looking full while the plants grow.