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Silicon (Si) is a plant beneficial element associated with the mitigation of abiotic and biotic stresses. Most greenhouse-grown ornamentals are considered low Si accumulators based on foliar Si concentration. However, Si accumulates in all tissues, and there is little published data on the distribution of Si in plants. This knowledge may be critical to using Si to mitigate tissue-specific plant stresses, e.g., pathogens. Therefore, we quantified Si accumulation and distribution in petunia ( Petunia  × hybrida  Hort. Vilm.-Andr. ‘Dreams Pink’), a low Si accumulator, and sunflower ( Helianthus annuus  L. ‘Pacino Gold’), a high Si accumulator. Plants were grown in a sphagnum peat: perlite substrate amended with 0% (−Si) or 20% (+Si) parboiled rice hulls for 53 (petunia) or 72 days (sunflower). Aboveground dry weight was greater in nonamended petunia (13%) and sunflower (18%), compared with rice hull–amended plants, but days to flower was unaffected. Sunflowers grown in the rice hull–amended substrate had the greatest Si concentration in leaves (10,909 mg·kg −1 ), whereas roots (895 mg·kg −1 ), stems (303 mg·kg −1 ), and flowers (252 mg·kg −1 ) had lower, but similar Si concentrations. In petunia, Si concentration was greatest in leaves (2036 mg·kg −1 ), then roots (1237 mg·kg −1 ), followed by stems (301 mg·kg −1 ), and flowers (247 mg·kg −1 ). The addition of rice hulls to the substrate increased Si concentration in sunflower 414% in roots, 512% in flowers, 611% in stems, and 766% in leaves. By contrast, Si concentration in petunia increased only 7% in flowers, 105% in stems, and 115% in leaves, but increased 687% in roots. In rice hull–amended sunflowers, the distribution of Si was 91% in leaves, 3% in stems, 3% in roots, and 3% in flowers, and in petunia, it was 72% in leaves, 17% in stems, 6% in roots, and 5% in flowers.

Silicon Accumulation and Distribution in Petunia and Sunflower Grown in a Rice Hull-amended Substrate