Both formats deliver the same kind of slow-release nutrients; the real difference is where and how they release them. Granular fertilizer spreads across the whole root zone from the surface, while a spike concentrates nutrients at a single point driven in below ground.

How does granular fertilizer feed a tree?

Feeding the whole root zone from the surface rather than concentrating nutrients at a single point is how a granular product works. TreeHelp Premium Fertilizer covers a mature tree, or two to three smaller ones, from a single 3.3 lb bag applied once each season.

How does a fertilizer spike feed a tree instead?

A fertilizer spike works by driving nutrients straight into the root zone at a single point instead of spreading them across the surface, which is why TreeHelp Complete Palm Fertilizer Spikes, once inserted into the soil, keep releasing nutrients from that same point for up to 12 months. TreeHelp's complete, multi-nutrient spikes are built for palms specifically; other species get single-nutrient supplement spikes, such as iron or manganese, instead of a full fertilizer in spike form.

Which format holds up better in sandy or fast-draining soil?

Nutrients wash out of sandy soil quickly before roots can take them up, which is why a palm spike is built to provide a constant supply at depth instead of a single surface dose that leaches away sooner.

Frequently Asked Questions

Is one format always better than the other?

It depends. Soil type and tree size decide which fits better, not one format being universally superior to the other.

How much do fertilizer spikes and granular fertilizer cost?

A case of 10 palm fertilizer spikes is $17.95 (or $1.85 per spike), while a 3.3 lb bag of granular fertilizer that covers a mature tree on its own is $15.95.

How long does each application last?

Granular fertilizer feeds a tree through one full growing season from a single application; palm fertilizer spikes last up to 12 months.

Does a potted tree need a different amount than one in the ground?

Yes. A potted tree typically needs only 1 to 2 spikes, or a smaller share of a granular bag, instead of the full dose a mature, in-ground tree gets.

Does using an auger to insert spikes add any benefit over hammering them in?

Yes. An auger, such as the TreeHelp Soil Drill, increases soil aeration at the same time and is easier to apply than driving spikes in by hand.