The best replacement for seedlings is seeds.

The best alternatives to seedlings are rated as following:
★★★★★  seeds
★★★★  transplants
★★★  saplings
★  maple seedlings

Your alternative for seedlings is not listed? Suggest!
Speaking about seedlings, one probably shouldn't forget about grow lights.

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



Google Trends

Scale is based on the average worldwide traffic of seedlings in all years. Click on graph for more.
seedlings
seeds
transplants