For a big job like cutting back a columnar specimen, use a saw and remove the main trunk at the point at which you would like to see branching or at the height you require the plant. Try to remove the stem at a growth point. Plants like agave will need the old leaves removed to preserve the appearance. Cut them away at the base of the plant Here is a step-by-step guide on how to grow cactus from seed: 1. Collect and Prepare the Seeds. Before you can plant cactus seeds, you need to collect them from a healthy cactus plant or a reputable seller. It’s essential to use fresh and healthy seeds for planting, as old or damaged seeds may not germinate. The golden barrel cactus requires at least six hours of direct sunlight to survive and thrive. So, you need to position it on a south-facing windowsill for better results. Provide well-draining potting mix and water it at least once during the growing season (spring and summer). Plant the Mexican Fence Post Cactus in loose, well-draining soil and allow it to dry out between waterings. It needs at least 6 hours of full sunlight daily. Fertilize sparingly with an organic cactus mix during spring and summer. Thrives best in temperatures between 70°F and 80°F (21°C to 27°C). 3 Essential Points. Here are the 3 most essential points to know about growing cacti indoors: they need high light, infrequent watering, and a light, chunky, well-aerated soil mix. Indoor cactus care is simple as can be. Tabletop cacti are great for small spaces and won’t outgrow their pots anytime soon. . Here is a step-by-step guide on how to grow cactus from seed: 1. Collect and Prepare the Seeds. Before you can plant cactus seeds, you need to collect them from a healthy cactus plant or a reputable seller. It’s essential to use fresh and healthy seeds for planting, as old or damaged seeds may not germinate. Rat Tail Cactus (Aporocactus flagelliformis) diane555 / Getty Images. The rat tail cactus, also called monkey tail cactus, is one of the showiest cacti you can grow. It works great in hanging A: Your saguaro looks like it needs some water. The recommended irrigation schedule for cacti is once every 10 to 14 days in the summer and every 21 to 28 days during the spring and fall to a A good rule of thumb is to water a Christmas cactus every one to two weeks in the spring and summer, and every three to four weeks in the fall and winter. In warmer zones, Christmas cacti can be misted daily, watering thoroughly only when the soil has completely dried out. "The most common killer of cacti is over-watering," says Musgrave. Repotting is best done early in spring, when your cactus is coming out of its dormant phase and starting to grow again. Wait until your cactus is just about ready to be watered—mostly dry soil is easier to remove from the pot, and will cause less damage to your cactus’ roots. Next, prepare your cactus’ new home.

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