Succulents and cacti: what separates the two and how their care differs

Quick Answer

Succulents are thick-leaved or fleshy plants designed to survive in arid environments, a broad category that includes various families of desert flora. Green Writer wrote this page for readers who want to distinguish succulents and cacti to ensure they provide the correct drainage and light for each species.

Cacti often require more intense, direct sun than many common succulents, which can tolerate slightly dappled light. To grow various types of succulents, avoid overwatering which causes root rot, a condition where excess moisture prevents oxygen from reaching the roots and leads to tissue decay.

Cacti are a specific family of succulent plants

Cacti are a specific group of plants belonging to the Cactaceae family. They are characterized by specialized structures like spines and a thick, waxy skin. Identifying them correctly helps you distinguish them from other types of water-storing plants.

Succulents are plants that store water in their tissues

Succulents are a broad category of plants that have evolved to store water in their leaves, stems, or roots. This biological adaptation allows them to survive in arid environments or during periods of drought. Knowing this helps you understand why these plants need specific drainage and infrequent watering.

Core differences between succulents and cacti

Cacti are a specific botanical family within the larger group of succulents. All cacti are succulents because they store water in their tissues. However, not all succulents are cacti. To ensure growth, you must plant succulents in a pot without drowning the roots, as a plant is only a cactus if it belongs to the Cactaceae family and possesses certain physical structures.

Identify cacti by their areoles

To identify your plant, look for arebs. Cacti have areoles, which are small, cushion-like bumps from which spines, hairs, or flowers grow. If a succulent lacks these specific bumps, the plant is not a cactus. You can confirm this by inspecting the stem surface under a magnifying glass.

Soil and moisture needs vary

Care requirements vary based on these traits. Cactus succulents require specific soil that drains quickly to prevent root rot. You must water a cactus less frequently than many other succulents because their thick stems hold moisture longer. If a plant has large, fleshy leaves instead of spines, it likely requires more consistent moisture.

Defining the botanical split

The distinction between cactus and succulents rests on lineage. Cacti belong to the Cactaceae family. Succulents describe any plant that stores water in leaves, stems, or roots.

This distinction helps you determine the correct way to wire or repot your specific species. Repotting is the process of moving a plant from one container to a larger or different one.

Are all cacti considered succulents?

All cacti are considered succulents because they share the trait of water storage in their tissues. Succulents include many plants like aloe and jade that do not have spines or specialized ribs. While the two groups share a common biological strategy for surviving dry conditions, they belong to different botanical families.

Spines and leaves define types

The difference between cactus and succulents involves specific structural adaptations. Cacti grow spines instead of leaves to reduce moisture loss. Most succulents retain small leaves or thick stems to hold water. You can grow various types of sedums by looking for these distinct physical traits.

Cactus classification as a succulent type

Botanists group cacti as a subset of the succulent category. This classification relies on the ability of the plant to store water in its stems, leaves, or roots. Cacti grow in arid environments where they must survive long periods without rain. Succulents also occupy these dry regions but utilize different morphological features to manage their water supply.

Succulents that are actually cacti

Some succulents are cacti. These plants belong to the Cactaceae family but share the fleshy, water-storing characteristics of other succulents. You can choose succulents for beginners by their botanical classification rather than their outward appearance or growth habits.

Crossover species list

• Opuntia species produce flat pads that store water for dry periods.
• Pereskia species grow small spines and thick stems to survive heat.
• Cactaceae family classification defines the difference between succulents and cacti.
• Cactus succulents grow in arid environments where they store moisture in stems.
• Succulents with cacti features often possess areoles, which are small bumps from which spines grow.

Identifying crossover species

Identify crossover species by looking for areoles. Areoles are small, cushion-like structures on the surface of the plant. True cacti possess these structures to sprout spines or branches. Most other succulents lack these specific growth points.

How does the watering frequency differ between these two groups?

The watering frequency differs because cacti generally require less frequent hydration than most succulents. Cacti store water in thick stems and survive long dry periods. Succulents often have higher surface area and require more frequent moisture. You must check the soil moisture to decide when to water each plant.

Evaporation rates affect watering needs

Evaporation rates change based on the environment. High evaporation requires more frequent watering for succulents to prevent wilting. Low evaporation allows cacti to remain dry for longer intervals.

Watering schedule comparison

Plant Group	Soil Moisture State	Watering Frequency
Cactus species	Dry to crumbly	Wait for dry soil
Succulent species	Damp to dry	Check every few days
Tropical succulents	Moist and consistent	Water more often
Desert cacti	Completely parched	Water very rarely

Moisture needs for different desert plants

Cacti need deep soakings followed by complete drying of the pot. Succulents require a cycle where the top inch of soil dries out before the next application. These differences depend on the specific water storage capacity of each species and how you set up grow lights for succulents.

Soil requirements for cacti and aloe vera

Cacti require a gritty, fast-draining soil mix with high mineral content. Succulents generally need a well-draining mix that retains slightly more moisture than cactus soil. Both types require a substrate that prevents water from pooling around the roots to avoid rot.

Soil mix requirements

• Pumice provides a porous structure that creates air pockets within the pot.
• Perlite adds lightweight aeration to the mix to prevent soil compaction.
• Sand increases the weight and drainage speed of the substrate.
• Aloe vera requires a porous mix that allows the roots to breathe.
• Cacti need a high ratio of inorganic material to organic matter.

Comparing drainage needs for specific species

Cacti require a soil mix that dries out completely between waterings. A soil mix is a combination of different materials like sand, peat, and perlite used as a growing medium. Aloe vera needs a substrate that drains quickly but holds some moisture for a few days.

Replant cacti in a heavy grit mix to ensure rapid drainage. You can replant succulents that have outgrown their pot or set up aloe vera in a mix with more organic components to support its growth.

Identify your ideal environment to choose the right succulents and cacti

Selecting the correct plant depends on your available light and space before you purchase any new greenery.

Care and placement checklist

1. Audit your available sunlight throughout the day. Observe your intended planting area. Note if the spot receives direct sunlight or shade for several hours.
2. Verify your light levels against the required minimum. Ensure the area provides at least four hours of direct or bright indirect light every day. Bright indirect light is illumination that is intense but does not come from direct contact with the sun. If it provides less, choose a different location.
3. Categorize your chosen plants by their specific water needs. Group your desired plants into those that prefer drier soil and those that need more moisture. This ensures you do not overwater the cacti.
4. Consult a local nursery professional about specific varieties. Ask a nursery professional which specific species thrive in your particular light conditions. A match means you can proceed with the purchase.
5. Select the specific plants that match your light audit. Choose the plants that thrive in your specific light levels. If the light is insufficient, wait until you can move the pots to a brighter spot.

Frequently asked questions