What is a thistle sock? What is a thistle feeder?

Last Updated on January 18, 2024 by Greg Gillson

You may have heard the term “thistle feeder” or “thistle sock” in regards to bird feeding but perhaps don’t know exactly what that is. So, first, here is the definition.

A thistle feeder is a specially designed birdfeeder that dispenses the seeds of the niger (also trademarked as “Nyjer”) flower Guizotia abyssinica. A thistle sock is a type of thistle feeder made with an open weave fabric mesh that resembles a sock.

Continue reading to learn more about thistle feeders. Thistle feeders can really attract the most colorful birds to your bird feeding station and backyard. I’ll tell you how to set them up and maintain them in order to get the most out of your thistle feeder and keep birds coming back.

What is a thistle feeder?

Also called a finch feeder, thistle feeders vary in construction. Thistle feeders can be a clear plastic tube feeder with very small dispensing holes. Thistle feeders can be metal bird feeders with a small mesh screen. And they can be fabric thistle socks. In each case, a seed is pulled out of the feeder by the bird, it is not supposed to fall out on its own. The seed is not provided loose, as on a tray.

American Goldfinch on tube thistle feeder Image by aekadtke from Pixabay

Clear plastic tube feeders for thistle are similar to other tube-style seed feeders. However this type of thistle feeder uses very small dispensing holes so that the thistle (niger seed) does not fall out easily. Instead, the small finches that eat this birdseed pull the seed out of each dispensing hole.

There are three main styles of tube thistle feeders. The typical kind is shown above. It has 6 feeding ports, each with a perch below. Larger sizes with more feeding ports are available. Typical lengths are 17 inches and 36 inches tall.

A variation on this is a feeder that has a perch that spirals around the tube several times. It doesn’t necessarily have more feeding ports. Rather, the continuous spiral perch allows more birds on the feeder to take their turn and not fly off. It seems like a really clever idea.

Speaking of unique, one manufacturer has an “upside down” thistle feeder. The feeding ports are below the perches. Finches hang upside down to reach the food! Finches don’t mind doing this, as they naturally feed on the tips of flower heads and trees to reach seed. But this kind of setup may keep undesirable larger birds from raiding the seed.

Lesser Goldfinches on metal mesh thistle feeder Photo by Greg Gillson

Metal mesh thistle feeders allow birds to perch anywhere on the side of the feeder. The screen-like mesh allows seeds to be extracted from anywhere on the feeder, unlike the plastic tube feeders from which seed is only dispensed from a very few ports.

These are sturdy feeders and will likely last many years. Some have broader covers over the top to keep out the rain. Some have wider trays at the bottom that may catch seeds that fall out.

Some thistle feeders have internal baffles that help distribute the seed better throughout the feeder. Without such a baffle, when the seed is low, it is all at the bottom of the feeder where only a few birds can feed at a time. With baffles, even if the seed is low, it is still distributed to several levels of the feeder. This allows more birds to feed at once until it runs out of seed.

American Goldfinch on a thistle sock Image by Paul Brennan from Pixabay

Thistle socks are fabric mesh feeders through which the pointed thistle seeds protrude. Finches land on the mesh and pull out the seeds.

This is what usually comes to my mind when someone says thistle feeder. Thistle socks do, indeed, look like a white tube sock. Some are small, only a foot long or so. Others can be 30 inches long. They have a drawstring at the top to refill when empty.

Because they are fabric they aren’t very expensive, which is good. On the other hand, they may mold or deteriorate more quickly in wet winter weather. They can snag or develop holes that waste seed onto the ground. So they don’t last as long as the metal mesh feeder, for example.

What kind of seeds go into a thistle sock or feeder?

Thistle feeders are designed to feed wild birds with the seeds of the niger plant Guizotia abyssinica. The niger plant is an erect annual herb with a yellow flower in the aster, daisy, sunflower family.

Niger is native to Ethiopia and Malawi. It is also grown in India. The seeds from the plant yield cooking oil that is a substitute for olive oil. The seeds are also used as food in India and for medicinal purposes in Ethiopia (source).

Niger seed is grown for birdseed and sold world wide. Despite frequently being called thistle seed, niger is not a thistle. Early on niger seed was marketed as “thistle” seed as the finches who eat niger seed are well-known for eating thistle seeds. The thistle name stuck for the feeder. 

Nyjer is trademarked by the Wild Bird Feeding Industry association for niger seed. So that is the name you will often see when buying packaged birdseed. Niger seed and Nyjer and thistle all refer to the same seed, Guizotia abyssinica.

The actual seeds are similar to sunflower seeds, though black, smaller, and much thinner. Despite their small size, they still have two inedible hulls on each side of the edible kernel. Seeds are sterilized with high heat to prevent it from growing and becoming an invasive plant.

Pine Siskin (left) and Lesser Goldfinch (right) on thistle feeder Photo by Greg Gillson

What kind of birds are attracted to thistle feeders?

What birds eat thistle? 

The smallest and most brightly-colored of the backyard birds eat thistle or Niger (Nyjer) seed.

Thistle feeders are designed to dispense very small seeds to attract the tiniest of the finches. Finches feed primarily on seeds. Some finches eat larger pine cone seeds. Some finches eat tiny dandelion seeds. Each type of finch has a preferred food.

In North America, the most common kinds of birds that eat thistle include American Goldfinches, Lesser Goldfinches, Pine Siskins, House Finches and Common Redpolls.

Birds eat thistle all year round: spring, summer, fall, and winter. Birds especially like thistle or Niger seeds in winter. They can attract siskins and redpolls that may not be an every-year bird in your area.

Young goldfinches in fall may really swarm to your thistle feeders!

American Goldfinch Photo by Greg Gillson

American Goldfinches are the most common and widespread of the birds that eat thistle seed.

American Goldfinches are found to Canada in summer, to the Mexican border in winter, and across most of the mid-latitudes of the United States year round. 

Thus, these bright birds are likely to visit your thistle feeders at some time of year no matter where you live in the lower 48 States and southern Canada. 

Strikingly yellow, black and white in summer. In winter they molt into a much muted cream and brown plumage. Females lack black crown and are duller in both summer and winter.

Lesser Goldfinch Photo by Greg Gillson

Lesser Goldfinches are found in the West and southwestern United States and southward into Middle America. 

Lesser Goldfinches love to eat Niger seeds.

Greenish above, yellow below–including under the tail–they remain in this same plumage all year, unlike the American Goldfinch which becomes quite dull in winter. Females lack the black crown.

Pine Siskin Photo by Greg Gillson

Pine Siskins breed across Canada and extreme northern states of the US. Also from Alaska to Mexico in the mountains. In winter they descend to the lowlands and visit thistle feeders. Irregularly, they irrupt and become common in winter in large flocks throughout the lower 48 States. 

They are goldfinch-sized brown-streaked birds with yellow highlights in wing and tail.

Pine Siskins love Niger thistle seeds!

House Finch Photo by Greg Gillson

House Finches are commonly found in cities and backyards across the United States and Mexico. 

They are a bit larger than the other birds pictured here (6 inches long bill tip to tail tip, rather than 5 inches as the goldfinches). They have a larger bill and usually eat seeds larger than the niger seed. Nevertheless, they’ll eat the thistle seed occasionally. They are brown streaked birds of the trees (sparrows usually hop on the ground). Males have red crown, chest, and rump.

House Finches love to eat black oil sunflower seeds, but they will eat thistle too.

Common Redpoll Photo by Greg Gillson

Common Repolls live in subarctic forests and tundra. In winter they move south through Canada, rarely to the northern tier of states across the US. So, this is an unlikely visitor to your thistle feeder unless your winters are typically very cold and snowy. 

Common Redpolls eat thistle.

Their plumage is very pale, almost white, thinly streaked with brown, with males sporting a red cap and black chin.

Other: Other birds may eat Niger seed from thistle feeders occasionally. 

Birds noted to try it include Dark-eyed Juncos, Indigo Buntings, Purple Finches, Cassin’s Finches, Song Sparrows, some quails, doves and chickadees, too.

How to hang a thistle sock

Hanging a thistle feeder is not difficult. The tube type or metal mesh type thistle feeders have metal handles just like any other birdfeeder. They can go on poles or posts. They can hang from tree limbs. Marlene and I prefer shepherd’s hooks.

Thistle socks are generally just tied onto a horizontal limb or hook with the draw strings that make up the top of the sock. Then they hang freely. They wear out in the weather, so replace them if they get a hole or are soiled. Some types have a plastic top similar to other tube type bird feeders.

When you are thinking about thistle feeder placement there are a couple of things to keep in mind. 

Finches generally prefer trees to flee to. So placing the thistle feeder in or near a tree may make it more favored. On the other hand, you don’t want it too near the ground or near low bushes where a cat could hide and pounce. Some people advise placing thistle feeders away from other feeders. I’ve seen thistle socks high, low, in the open and nearly hidden in the bushes. They one thing they had in common? The birds loved them no matter what.

There is one thing about niger thistle seed, though. If it dries out it loses its oily goodness and the birds will not eat them. Don’t buy too much seed at a time. Keep it fresh. Squeeze the seeds with your finger nails to see if they are oily. If not, replace the seed with fresh.

Cleaning your thistle feeder

Plastic tube feeders and metal mesh thistle feeders may hold moisture. Seeds gum up in the bottom and begin to mold. If this happens, immediately throw out the bad seed and wash thoroughly with 10% bleach solution and scrub out.

Thistle socks may air dry after a rain. But mold will form if you live in a damp climate. If thistle socks become moldy throw them away. They are relatively inexpensive and are often sold as a pair. Only hang one at a time, so you have a replacement if the first one gets moldy or develops a hole.

Wrapping Up

The world of seed-eating finches is a fascinating one, full of diversity, adaptations, and intriguing facts! Here are some tidbits to get you hooked:

Feeding adaptations:

Seed-eating finches boast powerful jaws and thick, conical beaks designed for crushing and shelling seeds. Some species even have ridged palates for further grinding.

Their tongues can be surprisingly complex, featuring structures like barbs and bristles to manipulate and extract seeds from tight spaces.

Most seed-eaters have a large crop, a muscular pouch in their throat, where they can store seeds to eat later, especially during lean times. This allows them to forage efficiently and maximize food intake.

Variety and distribution:

Seed-eating finches are found on all continents except Antarctica, with a particularly impressive diversity in the Americas and Africa.

There are hundreds of species of seed-eating finches, each with its own preferred food source. Some examples include sunflowers for goldfinches, thistles for house finches, and conifer seeds for crossbills.

Many seed-eating finches forage in flocks, which helps them locate food sources more efficiently and provides protection from predators.

Frequently Asked Questions

How can I make a homemade thistle feeder for finches?

Making your own homemade thistle feeder for finches is a fun and rewarding project! It’s a great way to attract beautiful birds like goldfinches, house finches, and redpolls to your backyard while providing them with a vital source of food. Here are two easy methods to get you started:

Materials:

• Empty plastic bottle (around 1 liter or 32 oz)
• Scissors or craft knife
• Duct tape
• Dowel stick or twig (about 6 inches long)
• Birdseed funnel (optional)
• Birdseed (thistle preferred)

Instructions:

1. Clean and dry the plastic bottle. Remove any labels or stickers.
2. Cut two holes: Make two round holes (about 1-1.5 inches in diameter) on the sides of the bottle, roughly halfway up. You can use scissors or a craft knife for this.
3. Secure the dowel stick: Push the dowel stick through one of the holes and out the other, ensuring it fits snugly and won’t wobble. You can add some duct tape around the holes for extra stability.
4. Fill with thistle: Use the funnel (if desired) to pour thistle seed into the bottle through the open hole until it’s about 3/4 full.
5. Hang your feeder: Tie a sturdy string or rope to the neck of the bottle and hang it from a tree branch, shepherd’s hook, or other outdoor fixture. Make sure it’s accessible to birds but out of reach of predators.

How do I attract birds to my thistle feeder?

Attracting feathered friends to your thistle feeder might take a little patience and the right approach, but it’s definitely achievable! Here are some tips to set you on the right track:

Location, location, location:

Place your feeder in a visible spot, preferably near trees or shrubs where birds already spend time. Avoid hanging it directly under bright lights or near windows to prevent collisions.

Make sure the feeder is easily accessible for finches but out of reach of squirrels and other larger animals. Consider hanging it from a shepherd’s hook or mounting it on a pole.

Choose a location with some protection from wind and rain, providing the birds with a sense of security while feeding.

Feeder selection and maintenance:

Use fresh, high-quality thistle seeds. Old or damp seeds can deter birds and even harm their health.

Regularly clean your feeder with warm soapy water and let it dry completely before refilling. This prevents the growth of bacteria and mold that can be harmful to birds.

Do squirrels bother thistle feeders?

Generally, squirrels are not as interested in thistle feeders as they are in other types of bird feeders. Here’s why:

Thistle seeds are small and light: Their tiny size makes them less appealing to squirrels, who prefer larger, more calorie-rich foods like sunflower seeds or peanuts.

Thistle is difficult for squirrels to eat: The spiky husks and fluffy nature of thistle seeds make them challenging for squirrels to crack open and consume. They often find it frustrating and time-consuming, leading them to seek easier food sources.

Some thistle feeders have squirrel-proof features: Many commercially available thistle feeders have narrow openings or perches designed to deter squirrels while allowing birds easy access.

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