A topic cluster is one pillar page covering a subject broadly plus a set of spoke pages answering its specific questions, all interlinked. Google reads the structure as depth. Pick subjects with a real head query, write the spokes first and the pillar last, and judge results at the cluster level, not page by page.
What the structure actually does
A lone article about transplanting clones competes on its own merits. The same article inside a cluster — linked from a clone pillar, linking across to pages on rooting, yellowing leaves, and hardening off — carries evidence the site knows the subject. Internal links are how a crawler discovers that relationship, and anchor text is how it labels each page. The cluster does not rank because of magic. It ranks because coverage plus connection reads as expertise, the practical version of what Google's E-E-A-T framework describes.
Pick subjects with a real hub query
A cluster needs a head term worth anchoring: cannabis clones, live resin, autoflower growing, cannabis edibles. Test a candidate by typing it into Google and expanding People Also Ask. If the questions keep unfolding, there are enough spokes to justify the build. If autocomplete goes quiet after three suggestions, the subject is a single article pretending to be a cluster, and forcing it produces thin pages that help nothing.
Build the parts in the right order
- Spokes first. Eight to fifteen pages, each targeting one long-tail question. They can rank on their own while the rest is under construction.
- Pillar last. A broad guide on the head term that summarizes each subtopic in a paragraph and links to the spoke that covers it fully.
- Links in three directions. Every spoke links up to the pillar, the pillar links down to every spoke, and each spoke links across to two or three siblings where the text naturally calls for it.
Use descriptive anchors: "how to harden off clones," not "read more." The anchor is the label Google files the page under.
The worked example: a clone cluster
On my clone site the pillar is the complete clone buying and care guide. Spokes: clones versus seeds, transplanting steps, why clone leaves yellow, how clones survive shipping, hardening off, and what drives clone prices, among others. The spokes started ranking for their long-tail queries within weeks because each answered one narrow question cleanly. The pillar moved slower, then climbed as the spokes accumulated and their internal links pointed at it. That order — spokes produce early wins, pillar collects the compound interest — is the pattern to expect.
Measure the cluster, not the page
Filter Search Console to the cluster URLs, by folder if your URLs allow it, or with a page regex if they do not. Watch three numbers: total cluster clicks, total impressions, and the pillar position on the head term. A healthy cluster shows impressions rising across many spokes at once. When a cluster grows, feed it more spokes from new People Also Ask questions. When it stalls for a quarter, check whether two spokes are splitting one query and fold the weaker into the stronger.
Key takeaways
- A cluster is coverage plus connection: pillar, spokes, and internal links in three directions.
- Validate the subject first; if People Also Ask runs out of questions, there is no cluster to build.
- Write spokes before the pillar; they win long-tail queries early and hand authority to the pillar later.
- Track cluster totals in Search Console and expand winners rather than starting new clusters reflexively.
Frequently asked questions
What is a topic cluster?
One pillar page covering a subject broadly, plus a set of spoke pages that each answer a specific question about it, all connected by internal links. The structure shows a search engine the site covers the subject in depth, not just once.
How many spoke pages does a cluster need?
Eight to fifteen is a workable start for most cannabis subjects. Fewer than that and the pillar has little to summarize; beyond that, keep adding spokes as new questions appear in Search Console and People Also Ask.
Should the pillar or the spokes come first?
Spokes first. Each spoke targets a specific long-tail question and can rank on its own while the pillar is still thin. Write the pillar last, as a summary that links out to every spoke, and it launches with a full set of supporting pages behind it.
How do I measure whether a cluster works?
Judge the cluster as a unit. Filter Search Console to the cluster URLs, watch total clicks and impressions for the group, and track the pillar position on the head term. Expand the clusters that grow and fix or fold the ones that stall.
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