Echinocactus grusonii, commonly known as Golden Barrel Cactus, typically reaches 12 to 24 inches (30 to 60 cm) in diameter and up to 36 inches (90 cm) in height. It is fairly quick-growing at first, and then the growth rate slows. So you can expect to wait about ten years for the cactus to reach 10 inches (25 cm) in diameter. It gets its common name from its barrel-like shape.
You can sow Golden Barrel Cactus seeds outdoors in warm climates, but sowing them indoors is easier and will result in a higher germination rate. Expect the seeds to germinate in one to two months.
1. Soak the seeds overnight in room-temperature water. Soaking seeds will help increase germination rates.
2. Fill a seed tray three-fourths of the way with a slightly moist potting medium made with 1 part sand and 1 part high-quality potting soil.
3. Scatter two or three seeds per seed compartment on top of the soil. Then, cover the seeds lightly with a thin layer of sand.
4. Slip the seed tray into a plastic bag and tie it closed with a twist tie. Place the tray in a bright area but out of direct sunlight between 70 and 80 °F (21 and 27 °C).
5. Keep the soil slightly moist until germination. Spraying the soil with a mister or spray bottle, rather than watering it from the top, will help prevent the soil and seeds from becoming too wet. After the seedlings emerge, you can remove the bag and set the tray in a sunny area until they are several inches tall and large enough to transplant to a larger container.
Source: sfgate.com
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