Choose the Plants

Selection Principles

Learn your site’s conditions and the resources insects seek. Note the landscape layers you and your neighbors have and what’s missing.

Plant for the Site Conditions

  1. Few plants can thrive in all site conditions. The Champlain Valley is comprised of a wide variety of soils, derived from our glacial history, including: 

    • clay soils from the bottom of Glacial Lake Vermont;
    • sandy soils from the shores of the ancient Champlain Sea;
    • limestone outcrops

    In addition, the amount of sunlight and water available to plants varies by location.

  1. Many plants have multiple species which have evolved to tolerate different conditions. For example, there is a milkweed species adapted to sunny dry sand (butterfly-weed or Asclepias tuberosa), to moist areas (swamp milkweed or Asclepias incarnata) and yet another to woodland openings (poke milkweed or Asclepias exaltata)! Many powerhouse pollinator plants – goldenrods, asters, mountain mints and Joe-Pye weeds – also have species adapted to specific site conditions. 

  2. Read our "Determining Site Conditions" section before choosing plants.

Plant for the Insects

caterpillar Moth and butterfly caterpillars eat leaves; bee larvae rely on pollen after hatching; and many adult bees and wasps feed on nectar as they gather food for their larvae. Most insects live as adults for only a couple of weeks -- just long enough to mate, lay their eggs on specific plants, and collect packets of food for their nest site. 

  1. Choose a variety of host plants. About 90% of moth and butterfly caterpillars are diet specialists and are restricted to eating a limited number of plant species. A well known example is the Black swallowtail butterfly, who only lays eggs on members of the carrot family, like Golden Alexander. Birds, in turn, feed protein- and fat-rich caterpillars to their young. 

  2. Provide sequentially blooming pollen AND nectar sources between April and September. Pollen is full of the protein and fat that bees need to feed their larvae. Nectar is the sugar-rich food that provides energy for the short-lived adults to be able to find a mate, lay eggs and gather enough larval food reserves. Most perennials bloom for only 2-4 weeks.

  3. bee in flower Provide different flower shapes. Bees, wasps, moths, and butterflies come in different sizes and with different tongue lengths (short, medium, and long). They need different flower shapes to successfully collect nectar and pollen, from broad flat flower clusters with short tiny flowers (e.g. golden Alexanders, asters, and goldenrods) or long tubular ones (e.g. Monardas and Penstemons).

Consider Layers

Different landscape layers provide different habitat resources.

  1. Top Layer: Tree Canopy. Native trees really matter! Long-lived, broad-canopy hardwood trees provide the most benefit. If adding trees, make those selections first.

    1. Benefits for insects and birds:

      1. They’re the earliest spring source of pollen and nectar for pollinators.

      2. A mature tree provides the greatest amount of leaves (or biomass), for its footprint on the landscape. It is estimated that one mature tree is equivalent to about 3500 sq ft of ground cover plants!

      3. They are host plants for the largest number of moth and butterfly caterpillar species. 

    2. Benefits for the climate 

      1. Long-lived, large canopied tree species (like oaks) create the longest-term carbon sequestration vs. smaller, shorter lived species (like crabapples).

      2. Trees provide multi-decade cooling by shading heat-absorbent pavement and roofs in increasingly warm summers.

  2. Mid-Layer: Small Trees and Shrubs

    1. These are the important mid-spring source of pollen and nectar for pollinators

    2. They provide the next greatest amount of biomass for moth caterpillars, etc. for their landscape footprint. 

  3. Groundcover Layer: Perennials and Annuals

    1. These provide crucial late spring through fall sources of pollen and nectar for pollinators

    2. They greatly increase overall plant species diversity which in turn supports a wider variety of insects. For example, milkweeds are both host plants for Monarch butterflies, milkweed tussock moths, and milkweed leaf beetles, as well as a nectar source for numerous native bees and wasps. Little bluestem grass is a host plant for several skipper butterflies. Even our forest understory ferns are host plants.

  4. Other Considerations

    1. ​​​Evaluate the vicinity: Notice what flower and host plant resources are growing nearby, where diversity can be added, and what gaps need to be filled. 
      1. Does the area already have willows, poplar/cottonwoods, and red maples providing earliest season pollen/nectar resources? Does it already have oaks nearby that host hundreds of moths?
      2. What native trees, shrubs, and groundcover plants are already providing floral and foliage resources from April through September?
    2. Incorporate floral diversity and abundance. 
      1. Try to have at least three species blooming at the same time throughout the growing season.
      2. Plant at least 10 square feet of each species in the garden when possible (in a single block or clustered like in a meadow). Bees tend to collect from a single type of plant per foraging trip so it's important to make it worth their trip.
      3. Aim to add at least 10 larval host plants for moths and butterflies that are native to the area. 
    3. Pay attention to plant growth habits: clumping vs spreading. Spreading plants can require greater long term maintenance. Many of our favorite pollinator powerhouse plants have both spreading and clumping species, e.g. milkweeds, goldenrods, mountain mints, etc. Read plant descriptions carefully!

    4. Be wary of cultivars. Cultivars are plants bred for specific traits. Whether or not they are beneficial as habitat is a complicated matter.
      1. Straight species (aka “wild types”) in general have the highest ecological impact for pollinators and for the genetic diversity and resilience of the plants. 
      2. Avoid purple-leaved cultivars. The caterpillars ordinarily hosted by these species won’t eat their foliage, likely due to the bitter purple anthocyanins.
      3. Avoid double flowers. They provide little to no pollen and nectar for pollinators.
      4. For more information see Xerces Society’ advice on using cultivars. 
      5. Mt. Cuba Center’s research trials are useful for comparing the horticultural qualities and pollinator value of selected groups of species and their cultivars.
    5. Prioritize increasing plant diversity rather than focusing on whether plants are grown in Vermont or not. Native plant nurseries from New Jersey to Minnesota are important seed and plant sources for our ecoregion. 

 

Selection Tools

Here are starter plant lists, native plant sources and tips on pot sizes to look for. The online plant finders are powerful tools to help you create a plant list for your site.

Plant Lists

Grow Wild Starter Plant Lists
Four plant lists for the Champlain Valley organized by site conditions. They ensure reliable pollen and nectar resources for multiple pollinators during early, mid and late season.

  1. Sun - Dry Soils
  2. Sun - Medium to Moist Soils
  3. Part Shade - Dry to Moist Soils
  4. Shade - Dry to Medium Soils

Plant Lists for Tough Sites
If your site offers additional challenges, consider one of these resources for successful plant choices wherever you may be growing.

Plant Lists by Insects or Birds
To make a big impact in your garden, refer to a specialized plant list and help insure that you'll have resources for our great diversity of insects and birds!

Other Plant Lists

Vetted Online Plant Finders

The searchable plantfinder databases below can filter by site conditions such as sun exposure, soil moisture, plant size, bloom time, bloom color, and geographic range. Use these to make a plant list before plant shopping. 

Prairie Nursery - includes a filter by clay, loam and sand soil type, so important for our Champlain Valley sites with sand or clay soils.

Prairie Moon Nursery - has the largest number of plant species for our research and is an excellent reference for seed germination requirements.

Native Plant Trust - Garden Plant Finder - has an ecoregion filter for New England natives. We are in the Eastern Great Lakes and Hudson Lowlands with a more midwestern flora. There are multiple filters for fall foliage color, landscape use, ornamental interest, wildlife use, salt tolerance, etc. which include trees, shrubs and vines.

Crosscheck plant selections with these filters for more detail:

By host plants:
National Wildlife Federation - Plant Finder re: Caterpillar species - shows how many different moth and butterfly species are hosted by our plant choices. 

By bird visitors:
National Audubon Society - Native Plants for Birds Database - shows which birds are attracted to different plants at your site. 

Plugs, Pots or Seeds?

Our vetted lists of nurseries and plant finders provide sources for plugs, pots or seeds. There are benefits and drawbacks to each. 

plug plant Plugs or Small Pots

  • Benefits: These are young plants that grow vigorous root systems in their first year rather than foliage. They transplant well with high survivability. Plugs are less expensive than large pots and make larger installations more affordable. 
  • Drawbacks: Because plugs are diminutive, they tend to look like a bad hair transplant when first installed and will require some patience as they come into maturity. There are few local nurseries that currently offer plugs or small pots and these may need to be mail-ordered from out-of-state. 

Large Pots

  • Benefits: As more mature plants, pots provide the most instant gratification to an installation project. As the nursery industry standard, pots are readily available at local nurseries. 
  • Drawbacks: Large potted plants may be over mature, meaning they have lived in a pot for a long time and sometimes become root-bound; these plants can be slow to restart root and shoot growth. Pots tend to be the most expensive option. 

Seeds 

  • Benefits: Seeds are the least expensive when considering the number of potential individual plants per dollar amount. Check out Wild Seed Project’s information on propagating wild seeds in small pots in your backyard. 
  • Drawbacks: Some native seeds have specific germination requirements (like cold treatments), which requires more care and attention. Broadcasting seed directly onto a site may yield low germination depending on the species and site conditions. Seeds will produce seedlings which require time and patience to reach maturity.

Bare-root Plants

  • Benefits: These are typically dormant plants that can be planted during cooler seasons, as long as the ground is not frozen. It is important to ensure that these plants are propagated in nursery beds and not wild-dug. Bare-root plants have many of the same benefits and drawbacks as plugs. 
  • Drawbacks: Some may not survive transplanting.

Where to Buy Plants/Seeds

These businesses carry at least 40-50% native perennial plants/seeds:

Native Plant Sources:

  1. Read Navigating the Nurseries before your visit. (From Wild Seed Project.)
  2. Learn about cultivars. Native Plant Trust Director of Horticulture, Uli Lorimer summarizes what we know.
  3. Make a plant list using the above vetted online plant finders before nursery visits so plants purchased match the site conditions.

Chittenden County Nurseries

Native Plant Trust

  • Nasami Farm - Whately MA - notes seed provenance (county where seed was collected); can preorder Pollinator Kits and Plant Collections based on site conditions.

Online Nurseries 

Seedling Tree Nurseries - small sizes, limited ordering windows, hard to find regional natives.

Native Fruits/Nuts Nurseries 

Annual Plant Sales

Native Seed Sources

 

More on Plants

Lawn Alternatives

a lawn The trouble with lawns: 

Doug Tallamy says it best in this article from Homegrown National Park: lawns fail at all four universal ecological landscape goals.

  • They don't support a diversity of pollinators throughout the season
  • They don't provide energy that moves up through the food web (e.g. diverse native plant “caterpillar foods” eaten by caterpillars fed to baby birds)
  • They don't manage our watershed footprint
  • They don't remove significant carbon from the atmosphere.

Additionally, few of the flowering plants encouraged by the ‘No Mow May’ initiative, such as the dandelion, support North American native bee populations. This, and more, is explained by Sheila Colla (York University) in this article from Rewilding Magazine. Here are some of the currently developing research alternatives: 

Ecologically sound “lawn-like” alternatives being trialed:

  • Scientists in the Chicago area are researching plots of different lawn grasses and low prairie and meadow species. Because Chicago and the Champlain Valley are in the same ecoregion, these findings will be transferable. 
    • This visually attractive affiliate website by scientist/artist Liz Kozik distills this research into easily readable graphic stories. Check out all six tabs in the upper right corner! 
    • Here’s a useful graphic that compares the five lawn alternatives that are being tested. 
  • The Cornell Botanic Gardens created a quarter acre native lawn demonstration site in 2009 which they continue to monitor. This 30 minute YouTube video explains their process and the natural communities that inspired their plant choices, which are similar to those in the Champlain Valley.
  • Grow Wild is trialing lawn alternative plantings in the southeast sandy lawn of Burlington’s Lakeview Cemetery in partnership with Burlington Parks Recreation and Waterfront. We have been inserting small plants into the existing lawn, encircling them with small rings of wood chips, and monitoring their growth.

Some Additional References:

Check out our Where to Add Habitat section, and watch this clever New York Times video: How To Fall Out of Love With Your Lawn

Prairie Plants in Vermont

Pre-European contact, this region of the continent was primarily covered in forests, except for small grassland patches along wetlands, river and lake shores. Following contact, most of the region was cleared for agriculture and development, and seeded with Eurasian lawn, pasture and hay grasses. Many of these pastures and fields have naturally reforested over the past century as their agricultural use has declined. However, since current landowners may seek to retain some of these sunny open spaces, it is worth noting that these areas can be planted with appropriate native species to create new “Champlain Valley prairies”. 

Here, you’ll find a description of our ecoregion, some expected climate migration patterns, and useful explanations and relevant plant lists from nearby regions.

map of level 3 ecoregions in northeastern US From Native Plant Trust Garden Plant Finder

Our ecoregion: The Champlain Valley is in the Eastern Great Lakes/Hudson Lowlands ecoregion, shown in maroon on this map from the Native Plant Trust.

Notice how the Champlain Valley is part of a larger region along the St. Lawrence River watershed that extends west into Ohio along Lake Erie, thus connecting us to the northern prairie plains and plants. Its location at the eastern and northern edge of warmer climate plant communities makes the Champlain Valley home to unusual plant diversity.

Here is the full EPA Ecoregion Level III map, and here are descriptions of the Level IV Ecoregions of New England

Climate migration in motion:

This Migrations in Motion map, created by The Nature Conservancy, models likely bird, mammal and amphibian migration as climate change alters habitat. Our ecoregion’s connection with the Great Lake and coastal zones creates corridors for plants and animals as they move eastwards and northwards; therefore we should look west and south for current models of our potential future natural communities. 

Useful explanations:

Prairie Plant List Models:

For those who aspire to create prairie plant diversity that matches soil conditions on our sunny sites, we’ve assembled plant lists for prairie grasslands in our ecoregional-neighbor states: Ohio, New Jersey, New York, Pennsylvania, Michigan, Wisconsin and Minnesota. The latter states are along the southern edge of the recent glaciation that forced nearly the same suite of plant species (and their insect partners) southwards then back northwards with the advance and retreat of the Wisconsin Glaciation. 

Learn Seedling ID

When plants grow in suitable site conditions, they will start to disperse their seeds. When these seeds start to germinate, we need to learn how to identify their seedlings so we don’t weed them out by mistake! Here’s a spreadsheet of seed and seedling ID resources that a Chicago Botanic Garden intern assembled. A few resources stood out: