This vine’s aggressive tendrils and underground runners demand a removal strategy that targets both the visible growth and the hidden root system. If you are dealing with senecio peregrinus, you already know it is not a typical houseplant. This is a vigorous, fast-spreading ground cover that can quickly take over garden beds, climb over shrubs, and smother smaller plants. Understanding its growth habits is the first step to keeping it under control.
You might have heard it called “String of Dolphins” or the “Flying Dolphins” plant. While the common names sound charming, the botanical reality is that this plant is a robust grower. It is a hybrid, typically a cross between Senecio rowleyanus (String of Pearls) and Senecio articulatus (Hot Dog Cactus). The leaves look like tiny leaping dolphins, which makes it popular in hanging baskets. But when planted outdoors in the ground, it can become a persistent weed.
This guide will walk you through every aspect of managing this plant. We will cover identification, ideal growing conditions, propagation, and most importantly, how to remove it if it becomes invasive. You will learn the exact steps to protect your garden without harming the environment.
Understanding The Senecio Peregrinus Plant
Before you decide to plant or remove this species, you need to know what you are working with. The plant is a succulent, meaning it stores water in its leaves and stems. This makes it drought-tolerant and surprisingly resilient. It thrives in bright, indirect light and well-draining soil. However, its resilience is also what makes it difficult to eradicate once established.
The “dolphin” leaves are actually modified stems. They grow along trailing vines that can reach several feet in length. In the right conditions, this plant produces small, white, fuzzy flowers that smell like cinnamon. These flowers are attractive to pollinators, but they also produce seeds that can spread the plant further.
Identifying The Growth Patterns
You can spot this plant by its unique foliage. The leaves are curved and have a small “fin” on the side, resembling a jumping dolphin. The stems are thin and tend to root wherever they touch the soil. This is a critical feature for removal. Every node on the vine has the potential to develop roots. If you leave a single segment on the ground, it can start a new colony.
The root system is fibrous but dense. It forms a mat just below the soil surface. This mat can be several inches thick. The roots also produce small, tuber-like structures that store energy. These tubers are the main challenge for gardeners trying to remove the plant permanently.
Why It Is Considered Invasive
In many regions, particularly in coastal California and parts of the Mediterranean, this plant has escaped cultivation. It spreads rapidly along the ground, creating a dense carpet that prevents native seedlings from emerging. It also climbs over low walls and up tree trunks, shading out mosses and lichens. Because it is a succulent, it survives long dry periods, making it a tough competitor in arid climates.
You should check your local invasive species list before planting it outdoors. In some areas, it is illegal to sell or transport this plant. Even in containers, the seeds can blow into neighboring properties. Being a responsible gardener means understanding the potential impact of your choices.
Senecio Peregrinus Care Requirements
If you decide to grow this plant in a controlled environment, like a hanging basket, the care is straightforward. It is a low-maintenance succulent that thrives on neglect. The most common mistake is overwatering. This plant prefers to dry out completely between waterings. During the winter months, you should reduce watering to once a month.
Light is another crucial factor. It loves bright, indirect sunlight. A south-facing window with a sheer curtain is ideal. If the light is too low, the “dolphin” leaves will stretch out and lose their distinctive shape. They will revert to looking like small, elongated peas. If the light is too intense, the leaves will scorch and turn brown.
Soil And Potting Mix
You need a gritty, well-draining soil mix. Standard potting soil is too heavy and retains too much moisture. A mix of 50% cactus soil and 50% perlite works well. You can also add coarse sand to improve drainage. The pot must have drainage holes. This plant hates sitting in water, and root rot is the leading cause of death in cultivation.
When repotting, handle the vines gently. They are brittle and snap easily. However, any broken pieces can be propagated, so you do not need to worry about waste. Just place the broken stem on top of the soil, and it will root within a few weeks.
Watering Schedule And Fertilizer
Use the “soak and dry” method. Water thoroughly until water runs out of the drainage holes. Then, wait until the soil is completely dry before watering again. In the summer, this might be every 7-10 days. In the winter, it might be every 3-4 weeks. Always check the soil moisture with your finger before watering.
Fertilize lightly during the growing season (spring and summer). Use a balanced, water-soluble fertilizer diluted to half strength. Feed once a month. Do not fertilize in the winter. Over-fertilizing can cause the leaves to lose their variegation and become leggy.
Propagation Techniques For Senecio Peregrinus
Propagating this plant is incredibly easy. This is both a benefit and a risk. If you want more plants, you can simply take cuttings. If you are trying to remove it, this ease of propagation is your enemy. You must be thorough in your removal efforts.
To propagate, take a stem cutting that is at least 4-6 inches long. Remove the bottom leaves. Let the cutting callus over for a day or two. This prevents rot. Then, place the cutting on top of moist soil. Do not bury it deep. The nodes along the stem will send out roots.
Step-By-Step Cutting Method
- Select a healthy vine with no signs of pests.
- Use clean, sharp scissors to cut a 5-inch segment.
- Strip the lower 2 inches of leaves from the stem.
- Lay the cutting on a paper towel for 24 hours to dry the cut end.
- Place the cutting horizontally on the surface of a damp succulent mix.
- Press the stem gently into the soil so it makes contact.
- Mist the soil lightly every few days.
- Wait for new growth, which usually appears in 2-3 weeks.
You can also propagate in water. Place the cutting in a glass of water, ensuring the leaf nodes are submerged. Change the water every few days. Once roots are about an inch long, transfer to soil. Water propagation is fun to watch, but the roots are more fragile and need careful handling.
Common Propagation Mistakes
One common mistake is keeping the soil too wet. The cuttings will rot before they root. Another mistake is placing them in direct sunlight. They need bright, indirect light to root successfully. Also, do not cover the pot with plastic wrap. This creates too much humidity and causes fungal issues. Just keep the soil slightly moist, not soaked.
If you are propagating indoors, you might notice the cuttings shrivel up. This is normal for the first week. They are using stored water to produce roots. Once the roots establish, the leaves will plump back up. Be patient. Do not pull the cuttings out to check for roots every day. This disturbs the delicate new growth.
How To Remove Senecio Peregrinus From Your Garden
Now, let us address the main challenge. Removing this plant from the ground requires a systematic approach. You cannot just pull the vines and hope for the best. The underground tubers will regenerate. You need to remove the entire root system to prevent regrowth.
The best time to remove it is during the dry season. The soil is easier to work with, and the plant is less likely to re-root from broken stems. If the soil is wet, the stems will break easily, leaving pieces behind. These pieces will root and create new plants.
Manual Removal Strategy
- Start by cutting the vines at ground level. Use shears to cut them into manageable sections.
- Place the cut vines directly into a trash bag. Do not compost them.
- Use a garden fork to loosen the soil around the root mat.
- Lift the entire mat of roots and soil. Shake off excess soil to reveal the tubers.
- Pick out every tuber you can see. They are usually the size of a marble or smaller.
- Repeat this process in a grid pattern across the affected area.
- Wait two weeks and check for any new growth. Remove any new shoots immediately.
This manual method is labor-intensive but effective. You need to be thorough. If you miss even a small piece of tuber, it can regrow. The key is to stay vigilant. Check the area every week for several months.
Using Herbicides Safely
In severe infestations, you may need to use a systemic herbicide. Glyphosate is effective, but it is non-selective. It will kill any plant it touches. You should apply it carefully using a paintbrush or a sponge. Do not spray it on windy days, as drift can damage nearby plants.
Apply the herbicide to the cut stems. This allows the chemical to be absorbed directly into the root system. It is more effective than spraying the leaves. You should apply it in the late afternoon when the plant is actively transporting nutrients to its roots. This is the most effective time for systemic uptake.
Be aware that glyphosate can persist in the soil. It binds to soil particles and can affect future plantings. Use it as a last resort. Always follow the manufacturer’s instructions. Wear protective gloves and eyewear. Keep pets and children away from the treated area.
Preventing Future Infestations
Once you have removed the plant, you need to prevent it from coming back. The seeds can remain viable in the soil for several years. You should monitor the area regularly. If you see any seedlings, remove them immediately. Do not let them establish a root system.
You can also lay down a thick layer of mulch. This will suppress seed germination. A layer of 2-3 inches of wood chips or bark is effective. However, you must ensure the mulch is free of plant debris. Some mulches can contain seeds or stem fragments.
Landscape Fabric And Barriers
For a physical barrier, you can use landscape fabric. This is a woven material that blocks light and prevents growth. Lay the fabric over the soil and cover it with mulch. This is a long-term solution. However, it is not suitable for areas where you want to plant other things. It also prevents water from penetrating the soil.
Another option is to install edging. Bury a metal or plastic edging at least 6 inches deep around the perimeter of your garden. This will prevent the underground runners from spreading into new areas. This is a good preventive measure if you have neighbors with this plant.
Safe Disposal Methods
You must dispose of the plant material properly. Do not put it in your compost bin. The tubers can survive the composting process. Do not put it in your green waste bin unless your local facility uses high-temperature composting. Most municipal facilities do not reach the temperatures needed to kill the tubers.
The safest method is to put the plant material in a sealed plastic bag and throw it in the trash. This ensures it goes to a landfill where it will be buried. You can also dry the plant material in the sun for several weeks. Once it is completely desiccated, it is safe to dispose of. However, this takes time and space.
Frequently Asked Questions
Q: Is senecio peregrinus toxic to pets?
Yes, like many senecio species, this plant is toxic to cats and dogs. It contains pyrrolizidine alkaloids, which can cause liver damage if ingested. Keep it out of reach of curious pets. Symptoms of poisoning include vomiting, diarrhea, and lethargy. Contact your vet immediately if you suspect ingestion.
Q: Can I grow this plant indoors year-round?
Absolutely. It makes an excellent indoor plant. It thrives in bright, indirect light. You can keep it in a hanging basket near a window. It does not require a dormant period. Just reduce watering in the winter. It will continue to grow slowly throughout the year.
Q: Why are the leaves on my plant flattening out?
This is usually a sign of insufficient light. The plant is stretching to find more light. The leaves lose their distinctive “dolphin” shape and become flat and elongated. Move the plant to a brighter location. You may need to gradually acclimate it to prevent sunburn.
Q: How fast does this plant grow?
It is a fast grower. In ideal conditions, it can grow several inches per week. This is why it is so popular for hanging baskets. However, this rapid growth also makes it invasive outdoors. Regular pruning is necessary to keep it in bounds.
Q: Can I use regular potting soil for this plant?
No, regular potting soil is too dense. It retains too much water, which can cause root rot. You need a well-draining mix. Use a cactus or succulent mix. You can also amend regular soil with perlite or pumice to improve drainage.
Q: What should I do if it flowers?
Enjoy the fragrance. The flowers smell like cinnamon. However, if you are trying to control the plant, you should remove the flowers before they set seed. This prevents the plant from spreading. Deadheading also encourages more foliage growth.
Managing this plant requires awareness and consistent effort. Whether you are growing it as a beautiful hanging succulent or fighting it as a weed, understanding its biology is your best tool. The plant is not inherently bad. It is simply vigorous. With the right care and containment strategies, you can enjoy its unique beauty without letting it take over your garden. Remember to always check your local regulations and dispose of plant waste responsibly.