I had been growing dahlia since last 15 years. Usually i grows dahlia from cutting or seeds. Last 2 years i start growing dahlia from tuber. I found that seeds grown dahlia fare better than tuber in lowland tropic. Only 2 out of 8 tuber s sprouts, the other 3 had fungal rot which i think was due to high humidity. Seeds grown dahlia also live longer and had time to form tuber and new plant. Nevertheless tuber grown dahlia blooming faster and nonstop for 1 year then died slowly of exhaustion (this is my theory), it will use up all the food stores in the tuber while no new tuber was formed. I think the scenario is different in a cooler highland /mountain region.
The downside of growing from seed is you only know the type i.e. pom-pom, cactus, decorative etc but not the colour or whether it is double or single. Right know I’m waiting for 3 pots of seed grown dahlia to bloom.
|dahlia pom pom-still lush and growing|