Weed Eater Blade vs String: Which Trimmer Head Fits Your Lawn
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A weed eater blade vs string choice comes down to what you cut. Nylon string is the right head for soft grass along edges, fences and walls. A metal or plastic blade is the head to use when the growth is thicker, woody or stiff. Many battery trimmers now ship with both, so the real question is which head you will reach for most often and how much you want to swap between them.
Quick answer
- Use nylon string for soft grass, edging along a walk, and tight spots near fences and flower beds.
- Use a blade head for weeds, reeds and saplings, where string tends to wear down or wrap.
- Pick a multi-head trimmer if you have both kinds of growth, and check which heads are in the box.
- Check the cutting width and shaft length before you buy, since those set how the trimmer handles a yard.
How the two heads work
A string head spins a length of nylon line at high speed. The line flexes on contact, which is why it suits soft grass and is gentle near fence posts, brick and the base of shrubs. Because the line is thin, it cuts soft growth well but has less force against thick stems. Line also wears down with use, so the spool needs to be replaced or advanced.
A blade head uses a rigid cutting edge. Plastic blades are the lightest option and suit everyday trimming. Metal blades, such as stainless steel hex blades, are built for tougher stems and weeds. A circular saw blade is meant for branches and saplings. A blade cuts through growth instead of flexing against it, so it handles jobs where string would slow down or bounce off.
Match the head to the growth
Start with what grows along the edges of your property. If most of the trimming is grass that has grown over a walk or around a mailbox, a string head does the job with less risk of nicking a post or a planter. If the weeds are woody, the grass is coarse, or you clear reeds and young shrubs, a blade head reaches the stems that string would only bend.
The SmartGiant trimmer listing describes its blades for specific jobs: plastic blades for everyday lawn trimming, stainless steel hex blades for tough weeds and reeds, an alloy circular saw blade for branches and saplings, and nylon string for soft grass edges. The listing also says it handles woody brush up to 6 inches thick. That is a manufacturer claim and not something this site checked, but it shows the range one multi-head tool is built to cover.
Comparison table
| Item | Head type in listing | Power | Cutting width | Warranty |
|---|---|---|---|---|
| SmartGiant XC-009 cordless 4-in-1 weed wacker | Nylon string, plastic blades, hex blades, alloy circular saw blade | Battery, 12V, 20000 rpm | 6 inches | 12-month warranty (listing) |
| BLACK+DECKER BESTA510 string trimmer | Nylon string with AF-100 spool | Corded electric, 6.5 amp, 8000 rpm | 14 inches | 2 year limited |
| Husqvarna Titanium Force 0.095 line | Replacement trimmer line only | Used with a compatible trimmer head | Not stated for the line | 90 days |
Some values are not stated in the listings for every item, so those cells are marked where needed. Read the full spec sheet on the listing before you buy.
Option 1: SmartGiant cordless 4-in-1 trimmer (blade and string)
The SmartGiant XC-009 is the clearest example of a blade-and-string tool. The listing says it has four blade types: plastic blades for everyday trimming, stainless steel hex blades for tough weeds and reeds, an alloy circular saw blade for branches and saplings, and nylon string for soft grass edges. Two versions of this same model appear in the pack, with two listing numbers, and both carry the same bullet points. The spec sheets show a 12V battery, a 20000 rpm speed, a 6-inch cutting width and a 23-inch product size.
The listing says the trimmer ships with 2 batteries, 1 charger, 1 circular saw blade, 2 hex blades, 5 plastic blades, 2 nylon strings, 2 removable wheels, safety goggles, work gloves, an ergonomic handle, a grass deflector and a tool kit. It lists a telescoping shaft that adjusts from 34.6 to 51.2 inches and a weight of 7 pounds. The removable wheels carry part of the load, which matters if you push the trimmer along a lawn rather than hold it up.
The listing says each battery gives 120 to 180 minutes of trimming and recharges in 3 to 4 hours. Those are listing figures; runtime will depend on the work and the grass. Check the battery spec before you rely on it for a large yard.
The listing also describes a 4-lawn-tools design that can switch between string trimmer, brush cutter, mini lawn mower and edger. For someone who wants one tool for blade and string work, this is the most complete option in the pack. A safety lock button and a blade guard are included according to the listing.
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The second listing for the same SmartGiant model is here: View on Amazon
The second listing says the battery is a lithium-ion battery. The first says 1 12V battery is required. Both list the same model number, XC-009, and the same bullet points, so the battery spec is the only detail that differs between them.
Option 2: BLACK+DECKER BESTA510 string trimmer
The BLACK+DECKER BESTA510 is a string-only trimmer. It is corded electric, with a 6.5 amp motor and POWERDRIVE transmission. The listing gives 8000 rpm, a 14-inch cut path and an item weight of 6.3 pounds. It has an automatic feed spool, which the listing says feeds line without bumping. The listing also includes a cord retention system and a 2-year limited warranty.
This model turns into a wheeled edger by rotating the head, which makes it useful along sidewalks and flower beds. The listing says the trimmer includes an AF-100 spool, an auxiliary handle and a guard. It does not include a blade head. If you need blade work, this tool does not cover it, and you would need a separate blade attachment or a different trimmer.
Corded electric means the trimmer needs a power outlet or an extension cable. That limits where you can reach, but it removes the battery as a runtime limit. For a small or medium yard near an outlet, the BESTA510 is a simple string-only option.
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Option 3: Husqvarna Titanium Force 0.095 trimmer line
The Husqvarna Titanium Force 0.095 is a spool of replacement line, not a trimmer. It is a round, dimpled, co-extruded line of 840 feet with a 0.095-inch diameter. The listing says it is compatible with standard string trimmer heads and says it reduces noise by 50 percent. Those noise figures come from the manufacturer listing and are not verified here.
The listing describes the line as made from a commercial-grade polymer with copolymer resins, and says it is manufactured in the USA. It lists a 90-day manufacturer warranty. The spec sheet shows a 3-pound item weight and a model number of 639005106.
If you already own a string trimmer, this line is the item to restock. It does not help if you want a blade head. Check your trimmer head for the line diameter it accepts before you buy a spool.
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Review: the SmartGiant 4-in-1 in more depth
Of the three items, the SmartGiant trimmer is the only one that covers both heads in one tool, so it gets the closer look here. Its main strength is the range of heads in the box. The listing names nylon string, plastic blades, stainless steel hex blades and an alloy circular saw blade, and the kit described in the listing includes 5 plastic blades, 2 hex blades, 1 circular saw blade and 2 nylon strings.
The listing says the trimmer is built for light use by smaller users. At 7 pounds with removable wheels and a telescoping shaft that adjusts from 34.6 to 51.2 inches, the listing describes it as suitable for users from 5 feet to 6 feet 4 inches tall. The listing also says the cutter head rotates from 0 to 90 degrees, which lets you trim along a driveway edge without bending over. Those are useful details, but they describe the design and not how it performs on a given yard, so read them as the listing’s description.
The safety features in the listing are a lock button that stops accidental starts and a blade guard. Wear eye protection and gloves when you change heads, and keep the guard in place for any blade work. The listing includes safety goggles and work gloves in the kit.
The main limit is the cutting width. At 6 inches, the SmartGiant covers less ground per pass than the 14-inch BLACK+DECKER path. For a large open lawn, that difference adds time. For edges, beds and tight corners, the narrower width is an advantage because the head reaches into smaller spaces.
The battery spec differs between the two SmartGiant listings. One says a 12V battery is required and the other says a lithium-ion battery is required, and both say the batteries are included. Check the battery in the box when it arrives.
Who each head suits
Choose a string head if your main work is edging, soft grass around a patio, or trimming around fences where a blade could cut into wood or vinyl. The line is forgiving and reduces the chance of damage to hard surfaces.
Choose a blade head if you clear thick weeds, reeds, brambles or young saplings. A blade gets through stems that string would bend away from. The trade-off is that a blade needs more care: it must be kept sharp and guarded, and it can strike a stone and throw debris.
Choose a combined tool if you want to switch between jobs without buying two machines. The SmartGiant gives you both heads. The BLACK+DECKER gives you string plus an edger conversion but no blade. The Husqvarna line is for maintaining a string trimmer you already own.
Mistakes to avoid
- Using string on thick woody stems. The line will bounce and wear, and you will spend more time re-cutting the same growth.
- Using a blade near fence posts, stones or house siding. A rigid edge can chip wood and vinyl or throw stones.
- Fitting the wrong line diameter to a head. Check the head’s stated line size before you buy a spool, such as the 0.095-inch line in the Husqvarna listing.
- Running a blade head without the guard. Keep the guard on and the grass deflector in place for debris control.
- Assuming a listing figure is what you will get. Battery time, cutting ability and noise all depend on the job, so treat each listing figure as the manufacturer’s description.
FAQ
Is a blade better than string for weeds?
A blade head is generally the better choice for thick or woody weeds, because a rigid edge cuts through stems that a nylon line would bend around. For soft grass and edges, string is usually enough. The SmartGiant listing names plastic blades for everyday trimming, stainless steel hex blades for tough weeds and reeds, and nylon string for soft grass edges.
Can one trimmer handle both blade and string work?
Yes, if the trimmer comes with both heads. The SmartGiant XC-009 listing includes nylon string, plastic blades, hex blades and an alloy circular saw blade. The BLACK+DECKER BESTA510 listing describes a string trimmer with an AF-100 spool and no blade head, so it does not cover blade work.
Which head is safer around the house?
String is the gentler head near fences, siding and garden structures because the line flexes on contact. A blade can damage hard surfaces and throw debris, so keep the guard on and keep people and pets back. Wear eye protection and gloves whichever head you use.
How do I know which line size to buy?
Match the line size to the head on your trimmer. The Husqvarna Titanium Force listing gives a size of 0.095 inches and a length of 840 feet, and says it works with standard string trimmer heads. Check your trimmer’s manual or the head markings before you buy a spool, because a head designed for a different diameter may not feed the line correctly.
Do I need a corded or a battery trimmer?
A corded trimmer such as the BESTA510 has no runtime limit but needs a nearby outlet and a cord, which can get in the way. A battery trimmer such as the SmartGiant XC-009 goes anywhere but is limited by its battery. The listing gives 120 to 180 minutes per battery for the SmartGiant, a manufacturer figure that will vary with the work.
Bottom line
Use a string head for soft grass and edges, and a blade head for weeds, reeds and saplings. If you need both, buy a trimmer that includes both heads, such as the SmartGiant XC-009 in the pack. If you already have a string trimmer and need spool refills, the Husqvarna line is the replacement to check. Match the head to the growth, not to the price or the tool’s name.
Related reading
For a wider view of how these tools differ, read Brush Cutter vs String Trimmer: Which Does What. To compare battery models, see Top 10 Battery Powered Weed Eaters: 6 Real Picks Compared.
