While summer is in the rear view as fall has arrived in Southwest Washington, Reflector reporter Cade Barker's native-plant habitat begins to tell a story of the issues with extended drought.
The bright blooms of spring and summer have faded, the long days of summer have given way to cooler mornings, and the consequences of months without enough rain are becoming harder to ignore. To look back at spring in Barker’s habitat, visit thereflector.com/stories/a-look-into-the-busiest-month-in-a-native-plant-habitat,403032.
What once looked like a thriving collection of native plants during an article in May is now a mixture of survivors, struggling vegetation and bare patches that may not recover. Some plants are showing signs of stress that could prove temporary. Others appear to have suffered damage severe enough that replacing them next spring may be the only realistic option.
The drought has been one of the season’s most persistent challenges, but it has not been the only one. After taking a hands-off approach throughout much of the summer, allowing the habitat to develop with limited intervention, another familiar problem has become increasingly apparent: invasive weeds.
Leaving a habitat alone can provide native plants with the opportunity to establish themselves without constant disturbance. It also allows insects and other wildlife to use the vegetation for shelter and food. But nature does not necessarily favor the plants I wanted to grow. Without periodic management, weeds can take advantage of open ground, spread quickly and compete with native species for limited resources.
The lasting effects of a dry summer
The most concerning changes are visible in plants that have struggled to withstand the extended dry conditions.
In September, the Washington State Climate Office reported the Vancouver area only reaching 57% of its normal precipitation totals for the month.
Native plants are often selected by gardeners for their ability to survive in local climates, and many species can tolerate periods of limited rainfall once established. However, drought tolerance does not mean drought immunity. Newly planted specimens, shallow-rooted plants and species growing in exposed or particularly dry locations can be especially vulnerable when the soil remains dry for extended periods of time.
Some plants respond to water stress by dropping leaves, losing their color or allowing aboveground growth to die back. These changes can be part of a survival strategy, helping a plant conserve its remaining resources until conditions improve.
Other symptoms are less encouraging. Extensive browning, brittle stems and dead growth throughout a plant can indicate more serious damage, particularly when there is little evidence of healthy growth remaining.
In my habitat, a full-shade area that was lush with species diversity in the spring, was now just bare dirt and a couple of ferns barely surviving on Sunday, Oct. 11.
The challenge is determining which plants are dormant or stressed and which have actually died due to a lack of water.
Many of the plants in the full-shade pocket exist underground in the offseason, however, my fear is that the roots and bulbs are possibly no-more from the extended drought.
Replacing a plant too early could mean removing something that might have recovered with autumn rain and cooler temperatures.
For now, some plants will need to be watched through the fall and winter before their condition can be assessed with greater confidence. By next spring, it may be clear that certain losses are permanent and replacement plants are necessary.
No matter what, some mitigation will be required to try and create opportunities for rainwater to remain in certain areas longer.
Replacement plants will also present an opportunity to reconsider where particular species are planted in the habitat, how much direct sunlight they receive and whether their water requirements match the conditions of their location within the small habitat with varying slopes and soil conditions due to organic matter differences.
When a hands-off approach gives weeds an opening
Allowing a native habitat to develop naturally throughout the summer has its benefits. Leaving stems, foliage and other vegetation standing can provide shelter for insects, spiders and other small wildlife. Seed heads can offer food for birds, while undisturbed ground gives some organisms a chance to complete their life cycles.
But a hands-off approach has its limits.
Weeds have continued to take advantage of the habitat, filling spaces between native plants and establishing themselves where the ground is exposed. Some have grown alongside desirable vegetation, while others have occupied areas where drought-stressed plants have lost their leaves or died back.
The result is a familiar restoration dilemma: leaving an area undisturbed can benefit wildlife, but doing nothing indefinitely can allow aggressive plants to gain an advantage.
Native plants and weeds are not competing on equal terms in every part of the habitat. An established native shrub may be able to hold its ground, while a small native wildflower can quickly become crowded by faster-growing vegetation. A plant already weakened by drought may have even less ability to compete.
This is where the hands-off experiment became instructive for me. It shows which native plants can maintain their space with minimal intervention and which need more help to establish themselves.
Preparing for spring
Fall offers an opportunity to evaluate the habitat without expecting every problem to be solved before winter.
The first priority is identifying plants that may not survive and monitoring those whose condition remains uncertain. Rather than immediately removing every brown or leafless plant, it is worth allowing time for seasonal changes and autumn moisture to reveal which specimens are still viable in the habitat.
The second priority is managing weeds strategically. Seed-producing weeds may need attention before they disperse more seeds, while invasive or particularly aggressive plants may require root removal to prevent further spread. At the same time, vegetation that provides valuable wildlife shelter can remain where it does not threaten the establishment of native species.
It has also been worth documenting where the habitat struggled most during the drought. Areas that repeatedly dry out may be better suited to more drought-tolerant native species, while plants with greater moisture requirements may need different locations or additional support during establishment next spring.
When spring arrives, replacement planting, as well as some moving around of plants, can focus on filling the most important gaps rather than simply recreating what was lost this summer. New plants will need room to establish themselves, and selective weed management can give them a better chance of competing successfully.
The lesson for me from this summer is that a hands-off approach can reveal how a native habitat functions on its own, but it does not eliminate the need for human involvement. Allowing nature to take its course works best when paired with careful observation and timely, selective intervention.
