Best suet blocks for garden birds

Which suet blocks should you buy for garden birds? If you are new to blocks, buy the RSPB three-pack of 280g mealworm cakes. It lets you test whether local birds take the food without storing ten blocks for months. Where use is already steady, the ten-packs from Suet To Go and RSPB are practical alternatives. Use each cake in a rigid purpose-made holder and replace it when it becomes dirty, mouldy or stale.

This guide compares the food itself. If you need the wire or metal holder, use our separate suet-block feeder guide and check its internal dimensions before ordering a multipack.

The three packs in detail

RSPB mealworm cakes, three × 280g: best first purchase

The RSPB pack contains three individually wrapped cakes. RSPB lists mealworms alongside a blended fat-and-seed recipe; the exact wrapper should be checked for ingredients. One 280g cake is a useful trial portion for a garden where fat-food demand is unknown.

Put out one block and keep the other two cool and dry indoors. If birds do not use the exposed cake, do not keep replacing it with identical new blocks. Check feeder position, weather and whether local birds use fat food at all. The pack's drawback is likely higher unit cost than buying ten, but avoiding eight unused blocks is the better calculation for a first trial.

Suet To Go mealworm blocks, ten × 300g: best for proven demand

This is a ten-pack of slightly larger, 300g blocks. It suits an established feeding point that uses blocks reliably and has a holder with suitable internal clearance. Do not assume a holder made for 280g cakes will accept a 300g cake comfortably; check measurements and never force a block against sharp wire.

Ten blocks are a substantial supply. Plan clean, dry storage away from rodents and pets, and continue offering only one manageable outdoor portion at a time. The pack is not a shortcut around weekly cleaning or spoilage checks.

RSPB insect blocks, ten × 280g: best regular RSPB pack

RSPB's ten-pack offers the familiar 280g cake size for a garden where that size has already worked. “Insect” is the product flavour; inspect the current ingredient list rather than assuming a high proportion of whole insects or that a particular species will prefer it.

The advantage over the Suet To Go pack is the smaller individual cake size. The drawback is still the same bulk commitment. A quiet winter garden should stay with a small pack, even if the cost per cake is higher.

What makes a good suet block?

Feeder fit comes first. The cake must sit securely in a holder that allows birds access but does not require retail netting. Look for a lid or closure that remains sound in wind and for openings you can scrub. RSPB describes suet cakes as suitable for dedicated cake feeders; it does not make a block holder optional.

Ingredients matter more than marketing. Blocks may contain animal fat, cereal, seeds, ground nuts, fruit or insect material. Recipes differ, and product titles can change. Read the current packet if you need to avoid ingredients around pets or have a particular preference. Do not infer “all-natural” or superior welfare benefit from a broad product name.

Turnover matters more than storage volume. The RSPB feeding guide suggests suet should be eaten within seven days. Treat that as an outer limit, not a reason to leave a greasy cake out for a week through mild rain. Remove food sooner if it softens badly, smells stale, collects droppings or shows mould.

How to offer a block safely

Remove every wrapper, net or tie before placing the block in a rigid feeder. Hang it where you can inspect both sides, retrieve dropped crumbs and remove the holder for cleaning. Do not crumble it onto a bird table or leave it in loose retail netting. Current RSPB guidance and BTO hygiene advice focus on reducing shared contaminated surfaces and keeping feeders clean.

At least weekly, take the holder apart where possible, clear fatty residue from bars and corners, wash and disinfect in line with current guidance, rinse and dry it fully. If more than one block holder is used, separate them rather than crowding all visitors at one point.

The wider winter-feeding routine covers portions and water. For a different fat-food shape, compare fat balls and loose suet pellets; they need different feeders.

Frequently asked questions

Are suet cakes and suet blocks different?

Retailers often use the words for similar rectangular food slabs. Check the actual dimensions and weight for your holder rather than relying on the name alone.

Can suet blocks be left outside all winter?

One block can remain while it is being eaten and stays clean and sound, but inspect it daily. Remove it immediately if spoiled and clean the holder at least weekly. Keep unused blocks indoors as directed on the pack.

Do I need a special feeder for suet blocks?

Yes: use a rigid purpose-made cake or block holder of suitable size. A seed tube, retail net or flat tray is not an equivalent substitute.