<![CDATA[Johar plant (Cassia siamea Lamk) is a type of plant that can be categorized as a versatile tree species or a type of plant that has many uses. This study has the objectives of assessing the percentage level of plant life, knowing the concentration response of the onion bulb treatment to the parametrics used in the study and the best response to each treatment on the growth of the johar (Cassia siamea Lamk) plant. Observations using the RAL method (Completely Randomized Design) were 30 replicates and 4 treatments so that there were 120 research seeds. The results of the live percentage of johar (Cassia siamea Lamk) seedlings were treatment A (without treatment) of 93.33%, treatment B (dose of 100 gr/l water) of 96.66%, treatment C (dose of 150 gr/l water) of 96.66%, treatment D (dose of 200 g/l water) was 96.66%. So that the average percentage of live johar plants for all treatments was 95.83%. The treatment had a significant effect on increasing the height of johar seedlings, significantly on increasing the number of leaves of johar seedlings, and had no significant effect on increasing stem diameter of johar seedlings. Administration of growth regulators to treatment D with a concentration of 200 g/liter of water was able to provide the best and optimum response to increasing the height of johar seedlings by 18.76 cm, increasing leaf blades by 9.23 strands, and increasing stem diameter by 2.26 mm.Tanaman Johar (Cassia siamea Lamk) merupakan jenis tanaman yang dapat dikategorikan sebagai jenis pohon serbaguna atau jenis tanaman yang dimanfaatkan yang mempunyai banyak kegunaan. Penelitian ini memiliki tujuan yaitu mengkaji tingkat presentase kehidupan tanaman, mengetahui respon konsentrasi perlakuan umbi bawang merah terhadap parametrik yang digunakan dalam penelitian dan respon terbaik pada setiap perlakuan terhadap pertumbuhan tanaman johar (Cassia siamea Lamk). Pengamatan menggunakan metode RAL (Rancangan Acak Lengkap) yaitu 30 ulangan dan 4 perlakuan sehingga terdapat 120 bibit penelitian. Hasil persentase hidup bibit johar (Cassia siamea Lamk) yaitu perlakuan A (tanpa perlakuan) sebesar 93,33 %, perlakuan B (dosis 100 gr/l air) sebesar 96,66 %, perlakuan C (dosis 150 gr/l air) sebesar 96,66%, perlakuan D (dosis 200 gr/l air) sebesar 96,66 %. Sehingga hasil rata-rata persentase hidup tanaman johar untuk semua perlakuan adalah 95,83%. Perlakuan memberikan pengaruh nyata terhadap bertambahnya tinggi bibit johar, berpengaruh nyata terhadap bertambahnya jumlah daun bibit johar, berpengaruh tidak nyata terhadap bertambahnya diameter batang bibit johar. Pemberian zat pengatur tumbuh terhadap perlakuan D dengan konsentrasi 200 gr/liter air yaitu mampu memberikan respon terbaik dan optimum terhadap bertambahnya tinggi bibit johar sebesar 18,76 cm, bertambahnya helaian daun sebesar 9,23 helai, dan bertambahnya diameter batang sebesar 2,26 mm]]>
