Centennial Root Feeding: Your Sprinklers Were Watering Your Trees Too

For years, the trees in most Centennial yards have been getting a quiet assist. Twice a week from spring through September, sprinkler zones soaked the turf, and the honeylocust, maple, ash and spruce planted in the middle of that lawn drank from the same water. Nobody designed it that way. It is simply how suburban trees in the south metro have lived.

That arrangement ended on October 1. Denver Water amended its Stage 1 drought resolution this summer to prohibit lawn watering after September 30, and many south metro districts that distribute Denver Water follow the same rules. The utility has said the cutoff will last at least through next spring. A lawn can go dormant and green back up. A mature tree that heads into winter dry is a very different story.

Why Centennial Trees Feel the Sprinkler Shutoff First

Much of Centennial was built out from the 1970s onward, which means a large share of Centennial’s tree canopy grew up on irrigated turf. Those trees developed their absorbing roots in the top 12 to 18 inches of soil, exactly where sprinklers delivered water every few days. When that supply disappears, the roots have nothing to fall back on.

Colorado winters are already hard on trees. Humidity stays low, wind is frequent and long sunny stretches between snowfalls pull moisture out of the ground. Stack a record dry year on top of that, and the fine roots a tree depends on can dry out and die back well before spring arrives.

The Clay Problem a Garden Hose Can’t Solve

Trees can still be watered by hand under the current restrictions, so a hose might seem like the obvious fix. In Centennial, it rarely does the job. Much of the city sits on clay-heavy soil that seals over as it dries. Water from a hose pools on that crust or runs toward the nearest low spot, wetting the surface while the root zone a few inches down stays dry.

Hose watering also tends to stay close to the trunk. The roots that actually take up water extend well past the edge of the canopy, often covering an area two to three times wider than the tree is tall. Reaching all of them with a hose would take hours per tree and still leave most of the water sitting on top of the clay.

How Eden Tree Care’s Root Feeding Works

Root feeding uses high-pressure water delivered below the surface, directly into the root zone. That pressure is what makes the difference in Centennial’s soil. It allows us to:

• Hydrate root ends by placing water at the depth where feeder roots live instead of losing it to evaporation at the surface
• Saturate soil evenly across a much larger area than surface watering can cover, working from multiple points throughout the root zone
• Move water through heavy clay that would otherwise shed it, while improving soil structure around the roots

Spring Organic Fertilization Finishes the Program

Every root feeding program ends with an organic fertilizer application in spring. Our blend combines essential minerals, seaweed extract, humates, surfactants and humectants. The surfactants help water move through tight clay, the humectants help soil hold moisture longer and the seaweed extract and humates support new root development as trees come out of dormancy. The result is a tree that enters the growing season with a stronger root system and less water stress. You can learn more about our approach on our soil testing and fertilization page.

Which Centennial Trees Need It Most

Every tree benefits from water in a dry winter, but some are far more exposed than others:

• Trees planted in lawns that were on sprinkler zones until this fall
• Young trees planted in the last three to five years, which have small root systems and little reserve
• Spruce, pine and other evergreens, which keep losing moisture through their needles all winter long
• Trees beside driveways, patios and streets, where compacted soil and reflected heat dry the root zone faster
• Trees that showed scorched leaves, early leaf drop or a thinning canopy during this summer’s heat

Get Ahead of Winter Drought Injury

Winter drought damage rarely announces itself in winter. It shows up in spring as branch dieback, sparse leaves or limbs that never leaf out at all. By that point, the chance to prevent it has passed. Our ISA Certified Arborist team can walk your property, complete a tree assessment to identify which trees are most at risk and build a root feeding plan that keeps them hydrated until the restrictions lift.

Schedule a free estimate and we will build a root feeding plan for the trees in your Centennial yard.

Root Feeding FAQs for Centennial Homeowners

Can I still water my trees under the current drought restrictions?

Denver Water’s amended restrictions prohibit surface lawn watering and spray irrigation but still allow trees, shrubs and gardens to be watered by below ground methods only. Root feeding is a targeted treatment applied directly to a tree’s root zone rather than to turf.

Why is root feeding better than a hose in Centennial?

Centennial’s clay soil sheds surface water, and a hose rarely reaches the full spread of a tree’s roots. High-pressure root feeding places water below the surface and distributes it evenly across a much larger area.

When should trees be watered in winter?

Winter watering works best on days above 40 degrees when the ground is not frozen, ideally around midday so water soaks in before temperatures drop overnight.

What happens in the spring?

Every root feeding program finishes with an organic fertilizer made from essential minerals, seaweed extract, humates, surfactants and humectants to promote root development and reduce water stress.