Urban xeriscaping works best when it reduces unnecessary irrigation while keeping the outdoor space useful. In a small city garden, reflected heat, paving, shade, containers and limited root space can matter as much as plant labels. A low-water landscape does not need to be a bare gravel yard.
Map the conditions you actually have
Observe sun and shade through the day, hot walls, wind corridors and where rain runs. Keep paths, seating and service access on the plan. Check property and local requirements before changing a frontage or shared boundary.
Identify useful existing plants before removing them. A mature shade tree may be difficult to replace, and its irrigation needs must remain part of the plan when surrounding turf is converted.

Balance water use with shade
Trees and other vegetation cool through shade and evapotranspiration. EPA’s explanation of vegetation and urban heat describes these mechanisms. Removing shade and adding exposed hard surfaces can undermine comfort even if the irrigation meter slows.
Retain suitable healthy trees where practical and select new plants whose mature size fits the available space. Do not assume all shade trees are equally thirsty or every succulent is suitable for the local winter and rainfall.

Use plants suited to the site
Choose for the combination of climate, drainage and exposure. A local native from a wet habitat may not belong in the driest bed. Avoid invasive species and leave enough space for the plants to develop without constant shearing.
Group plants with similar water needs. Keep a regularly watered container collection separate from an established dry-adapted border rather than forcing both onto one schedule.

Convert gradually and water establishment roots
Start with an area that is awkward to mow or irrigate and has little recreational use. Plan soil preparation and drainage for its intended plants; do not assume adding organic matter fixes every soil.
New plants need establishment attention even when they will tolerate drought later. Check root balls and surrounding soil separately. Colorado State Extension’s retrofit guide also warns against abruptly removing water from established trees during turf conversion.

Make irrigation inspectable
Drip or another suitable system can target root areas, but inspect it for leaks, blockage and uneven wetting. Widen the watered area when necessary as plants grow. Adjust schedules for rain and season rather than leaving a summer setting in place indefinitely.
Mulch choices should suit the plants and exposure. Neither rock nor organic mulch eliminates weeds permanently. Check moisture below the surface and retain any deliberately planned habitat areas rather than covering the entire garden by default.

Judge the result by use and performance
Compare water records across similar seasons, while noting rain and establishment needs. Also ask whether the seating area remains comfortable, plants are healthy and maintenance is manageable. Savings cannot be promised as one percentage for every urban garden.
A successful design lets you enjoy the space with less waste. Preserve room for shade, planting and everyday activity instead of treating the removal of all irrigated vegetation as the objective.