How We Protect Your Plants During House Washing

Why plants need protecting at all

House washing uses a mild cleaning solution to kill mildew and lift dirt from stucco and siding. That solution runs down the wall, and the plants closest to the wall catch it. Most of what reaches them is diluted, but leaves that are dry, thirsty or sitting in full sun can still get spotty burn. Protection is about controlling how much reaches the plant and how long it stays there.

The good news is that the steps are simple. They just need to be done every time, in the right order.

Step 1: Water deeply the night before

A well-watered plant is the best defense. Deep watering the evening before fills the roots and leaves so they take up far less of whatever splashes on them. It also wets the soil so runoff soaks in more evenly instead of pooling at the stem.

If your irrigation runs on a timer, you can simply run an extra cycle. For drought-tolerant yards, a slow hand soak around the plants nearest the house is enough. You do not need to flood the whole yard.

Step 2: Pre-wet and cover what is delicate

On wash day, the crew wets every plant along the work area with plain water before any solution goes on. Delicate plants, new plantings, flowering annuals and vegetable beds can be covered with lightweight, breathable sheeting during application.

Covers come off as soon as each section is rinsed. Plastic left on a plant in direct sun can cook it faster than any cleaning solution would, so a cover is a short-term shield, not something left in place for the whole job.

Step 3: Work in sections and watch the heat

Solution should never dry on a wall or a leaf. On a hot day in the Valley, a wall in full afternoon sun can dry a mix in a few minutes. That is why crews often start on the shaded side of the house, keep sections small, and plan to work sunny walls earlier in the day.

Wind matters too. During Santa Ana conditions, overspray can drift onto plants you thought were out of range. Lower application pressure and shorter sections help, and on a very windy day it can be wiser to reschedule.

Step 4: Rinse the plants, the soil and the wall

After each section, the wall is rinsed top-down and the plants below get a generous rinse of their own. The soil at the base gets soaked too, which dilutes anything that reached the root zone. At the end of the job, a final rinse of the whole bed catches anything missed.

Runoff should be directed into landscaping or collected, never sent to the street. Los Angeles Municipal Code section 64.70.02 prohibits discharging untreated wash water from paved-surface washing and mobile operations into the storm drain system unless a permit allows it.

Succulents, edibles and other special cases

Succulents are common in LA yards and are usually tough, but their thick leaves hold water and can show spotting if solution sits on them. A thorough pre-wet and rinse is normally all they need. Avoid covering them in plastic for long, since they scorch easily under it.

Vegetable and herb beds should be covered and rinsed well, and it is reasonable to wait a few days and rinse again before harvesting. Climbing vines like bougainvillea or ivy on the wall itself can be pulled back gently or the area right around them washed by hand at lower strength. Potted plants are easiest of all: just move them away from the house before the crew arrives.

Our post on whether soft washing is safe for plants and pets explains the solution itself in more detail.

What to expect afterward

Most yards look exactly the same the next day, just with a cleaner house behind them. Occasionally a few tender leaves right at the wall line show light browning on the edges. That is cosmetic and grows out. Give the bed a normal watering the next evening and you are done.

At Say Wash It we treat plant protection as part of the job, not an add-on, and we look at the beds with you during the final walkthrough. House washing runs $0.35 per square foot of exterior wall as of October 2026, and the instant quote on this page gives you a starting number.