Tag Archives: raingardens

Planting for Pollinators: How Raingardens Can Help

In a world without bees, your next plate of food would have considerably less
variety. By some estimates, one of every three bites of food we take depends onMonarch pollinators like bees. Pollinators are the small creatures—among them bees, butterflies and hummingbirds—that carry pollen from plant to plant as they forage, unknowingly performing an important step in the production of fruits and seeds.

In recent years, we have observed severe declines in various pollinator populations. Honey bees are a key example. According to the USDA, beekeepers lost an average of one-third of their colonies every winter from 2006 to 2011. In the last couple of decades, the monarch butterfly population has declined 90 percent in North America.

This is worrisome. Consider the following: more than 80 percent of plants depend on pollinators for survival. In this country alone, bees and other insect pollinators contribute more than $24 billion a year to the economy.

Why are pollinators disappearing? A leading cause is lost habitat. Quite simply, many pollinators no longer have the food and other resources they need to survive. They are also vulnerable to pesticides, in ways that are currently being studied.

While this problem exists globally, we can act on a personal level to help solve the problem. Our gardening practices can create urban habitats that attract and sustain pollinators. Choosing native plants is a step in the right direction: pollinators and plants that evolved in the same areas generally benefit one another. For example, milkweed attracts bees and butterflies. To reproduce, monarch butterflies actually need milkweed because it is the only plant their caterpillars eat. Practices on this scale can establish pollinators in our own backyards.

Which brings us to raingardens, one of our favorite topics. Metro Blooms teachesCertified Raingarden people how to plant raingardens as part of our mission to promote gardening, beautify the community, and help heal the environment. These shallow depressions, planted with native vegetation, allow stormwater to be cleaned naturally as it soaks into the ground, diverting polluted runoff from our waterways.

Creating raingardens that are also habitats for native pollinators is, quite simply, smart design. The raingardens help clean and preserve natural bodies of water and function as habitats for bees, butterflies, and other insects and small animals that pollinate. In turn, the pollinators, just by doing what they do, help the raingardens thrive so they can work efficiently to clean our water.

Learn more at one of our eco-friendly raingarden workshops. This year we will offer lots of information on designing raingardens for pollinators: http://metroblooms.org/workshops.php

 Aleli Balagtas is a freelance writer interested inIMG_1374.JPG (1) gardening ecologically.

Seasonal Raingarden Maintenance Practices

Seasonal Raingarden Maintenance Practices

Each season has a small list of tasks associated with good raingarden maintenance practices. By staying on top of maintenance each season, problems can be avoided and maintenance can be a small task compared to a major chore. By taking a few minutes to peruse the garden, major maintenance headaches can be avoided. What follows is an overview of maintenance tasks for each season so that readers may avoid these major problems and have a pleasurable gardening experience.


In the early part of spring, after the snow has melted and before new plant growth has started for the year, remove last year’s decaying growth. We call this decaying plant material ‘duff’. Duff is a wonderful thing to let stand throughout the winter months as it provides habitat and food for over wintering birds, helps to insulate the ground during the coldest days of the year, and it can provide visual interest in the garden throughout winter. Once temperatures begin to rise, however, new growth will start to peak up through the soil and it will be good to have last year’s duff out of the way. Not only does this help to warm the soil by providing a little extra sunlight, it can be a very exciting time visually as well. Fresh new green popping up in the garden is a most welcome sign of the warm seasons to come.

There are many species of weeds that will take advantage of this time of the year. Cool season weeds will start to germinate in the spaces between your desired raingarden plants. This is an excellent time for pulling these weeds out before they have a chance to become established. Once weeds, especially invasive trees, are established they become a real problem to remove. What could be 10 minutes spent easily hand-pulling tiny saplings becomes hours spent digging out substantial root structure. This not only makes maintenance a horrible chore, it affects the health and performance of the desirable plants in the garden.  Check out our blog for photos of cool-season weeds here.

Typically, your desired perennial plants will have a larger more distinct clump form, as well as a designed pattern in the garden. Raingarden design typically employs multiple specimens of the same species organized into groups. This can be another clue to help in identifying which plants will want to be left, because weeds are very randomly spaced.

Spring is a good time to assess your mulch. New mulch is more easily applied in the spring because plant material has not grown in the way. It is easier to see bare spots where mulch is thin and soil is peaking through. A good rule of thumb for mulch is to maintain a 3” layer. This will provide a good barrier against weeds and will help to keep the soil moist for desired plants. Remember to always use double shredded hardwood mulch in raingardens because it binds together and doesn’t float during large rain events. Check the Blue Thumb webpage for local distributors of double shredded hardwood mulch. It is typically available in bags or in bulk and can be either picked up or delivered for a small fee.

Spring is also an appropriate time for replanting any bare spots in the garden. There are many options for how to approach replanting. By following the planting plan for a project, gardeners can choose to use the same plant variety they have in the design and replace missing plants with what is shown in the plan. Another option is to replace with a different type of plant altogether. This is a particularly good approach if several plants of the same species have completely died out. Perhaps the designed plant variety is not as well suited as the designer had originally thought and some experimenting with a new variety might warrant better results. Replacing with a new variety can be a fun way for participants to further engage and take ownership of their garden. The Blue Thumb Plant Selector Tool can be an invaluable resource for choosing plants and learning a given plants’ characteristics.

Another great activity for spring gardening is the division of established perennials. This is an activity for more established plant material that has reached maturity. Many varieties of established perennial plants can be dug up completely from their home in the garden and then divided into smaller specimens for use in other areas of the yard. This can be particularly useful for gardeners wishing to add another raingarden to their yard without the expense of purchasing new plants. Spring is the best time for division and transplanting because it gives transplants time to establish new roots throughout the coming growing season. A good rule of thumb is to try and find specimens for transplanting just after the new foliage has begun to peak up out of the soil. With a little research online, gardeners can discern which of their plants would be most appropriate for division and use in other spots of their yard.


Throughout late spring and summer, it is a good practice to peruse the garden on a semi-regular basis. The longest I would go between visits would be two weeks. During these garden visits, keep an eye on your plants. Watch as they change with the season. As early blooming varieties fade, you may want to prune away any decaying plant material you find unattractive. This will typically be fine for your perennials and it is common practice for gardeners to do what is called “dead-heading”.  Dead-heading is simply the removal of any plant material which starts to decay during the growing season. This is really a judgment call on the part of each gardener, as it is a matter of aesthetic preference. Remember that perennials will bloom and then produce seeds on what were once blooming flower stems. Gardeners can choose for themselves whether or not they would like to keep this material around or not. Perhaps a gardener will want to keep seed heads around for the benefit of feeding birds or for the possibility of growing more of a particular variety from the newly developed seeds. On the other hand, a gardener may want to spruce things up in the garden to highlight the aesthetic of blooms that have yet to come. This is purely subjective and gives gardeners the ability to more fully engage in the look and function of their garden.

Summer is also a good time to keep a look out for invasive weeds that will take advantage of warmer temperatures. Typically we talk about “cool season” and “warm season” weeds because each season will have different weedy culprits. This is why it is suggested that gardeners plan to weed in spring and summer. If you get into the habit of perusing your garden on a semi-regular basis, then this may not even be necessary as you may have developed the habit of taking a couple of minutes to pull out the weeds as you go. This approach is hardly a chore at all and more like a pleasurable little moment of time spent in the garden.  Should it happen that this habit is not entirely working, then it is at least important to plan at least some summer weeding to avoid the headache of tree saplings getting to large for easy removal.


Autumn is a good time to get at any of the weedy invasives that you may have missed during the summer. Make sure to inspect the garden for any invasive trees or turf grass that has made its way into the garden. By now gardeners can start to think about how they would like to leave their garden for the winter. Many native and ornamental grasses and sedge species can be particularly beautiful during the winter months. There are also many varieties of perennials that look attractive after they have gone dormant and seeds from these plants can be a good source of food for over-wintering birds. Remember that “duff” can be left all winter and removed as part of spring maintenance, but it also possible to remove anything that may be unattractive in the garden over the winter months. It is an aesthetic judgment that gardeners can make depending upon their own preference.

Another good thing to think about in late autumn and into the winter months is pruning shrubs that you may have in your garden. Prune shrubs after they have lost all of their leaves and have gone dormant for the winter. It is best to prune no more than 30% of living tissue from any shrub at a time. Remember that pruning is strictly an aesthetic practice. Many shrubs look fantastic if left alone until they have reached their mature size, so research your shrub species to learn about their height and width at maturity. Ultimately, however, shrubs can be pruned to fit a gardeners aesthetic preference so fastidious pruning can be an activity that gardeners use to create a desired look.

‘Garden’ is both a noun and a verb

One final note regarding raingardens…a garden is a noun and a verb. It is a place in your yard, but it is also the act of caring for that place in your yard. It is often the case that raingardens are planted and then left on their own with no maintenance. This results in an unsightly, weedy mess that for all intents and purposes is not in fact a raingarden at all. To have a raingarden implies the action of gardening. Gardening is maintenance… It is the care required in order for there to be a garden. Remember that gardening is as much of a chore as one makes it. With a little bit of effort, gardening can be a very rewarding experience!!

Dwarf Bush Honeysuckle

Family:  Caprifoliaceae

Scientific Name: Diervilla lonicera

A fast-growing deciduous shrub, the Dwarf Bush Honeysuckle is insensitive to changes in light and is found in woody, shaded sites as well as exposed, rocky sites.  It grows well in sandy, dry, and slightly acidic soils.  It is often found growing among Jack Pine (Pinus banksiana) and Balsam Fir (Abies balsamea). 

Watch for: Small, mound-shaped shrub to 3 feet tall.  Exfoliating bark reveals orange inner bark.  Dark-green simple, opposite, and pointy leaves change from yellow to red in autumn and small.  Bell-shaped flowers are yellow-green in early summer, becoming orange or purplish-red as the season continues.

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Metro Blooms Garden Evaluation and Awards

On November 7th, 2013 over 150 people gathered at the Columbia Manor in Northeast Minneapolis to recognize beautiful Minneapolis gardens, and the people that create them, at our annual Minneapolis Garden Awards event.  It was an awe-inspiring evening filled with stories of how many of these gardens came to be.  And just how did we choose these gardens? That would be the work of our fabulous volunteer garden evaluators…

Every spring Metro Blooms sends out the call to garden lovers everywhere. “Help us evaluate the beautiful gardens of Minneapolis, and don’t forget to nominate your own!”  Nominations are how the system works.  Metro Blooms nominates all of the gardens that we’ve helped install over the years, but we count on citizens to nominate the rest of the beautiful gardens out there.  Only raingardens, you may be wondering?  No, no, no.  We certainly love raingardens, but we love beautification gardens too and we want to know about them all!

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Neighborhood of Raingarden Installations 2013

Throughout the summer and fall of 2013, Metro Blooms has been working hard with the Conservation Corps of Minnesota and Iowa to install raingardens in fiveMCC crew at a raingarden they installed different neighborhoods in Minneapolis.  The projects were partnerships with neighborhood associations and community members as part of our Neighborhood of Raingardens program.  Some of these partnerships were new this year, and some have been ongoing for the last four years!  Regardless, each of these projects was a success and we hope all of our partnerships continue into the future.

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