The best replacement for shamrocks is clovers.

The best alternatives to shamrocks are rated as following:
★★★★★  clovers

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Speaking about shamrocks, one probably shouldn't forget about irish flag.

Other search terms related to shamrocks and their ratings are:
★★★★★ irish flag
You have in mind a companion for shamrocks and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of shamrocks in all years. Click on graph for more.
shamrocks
clovers