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Ideal for GiftingGreat for Beginners
Mammillaria spinosissima
Red Headed Irishman Cactus
Houseplant Size Guide
At Houseplant.co.uk, we want to ensure that you choose the perfect plant for your space. Here's how we measure our plants:
Plant Height:
Measured from the base of the nursery pot to the top of the plant, including the full length of the stem and foliage.
Pot Size:
Refers to the total width across the top of the pot.
Choosing the Right Size
To find the perfect fit, compare the diameter of your plant's grow pot to the opening diameter of your chosen decorative pot. Ensure the decorative pot is at least 1-3cm larger in diameter than the grow pot for easy insertion and removal.
Important Notes
- Plant sizes are approximate and include the depth of the plant pot and roots, not just the height from the top of the soil.
- If a specific plant size is not available, we may provide a larger plant at no additional cost to you.
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Ceramic Plant Pot (9 cm)
Ceramic Plant Pot (9 cm)
Ceramic Plant Pot (9 cm)
Ceramic Plant Pot (8 cm)
Ceramic Plant Pot (9 cm)
Ceramic Plant Pot (9 cm)
Ceramic Plant Pot (9 cm)
Plastic Plant Pot (9 cm)
Ceramic Plant Pot (8 cm)
Ceramic Plant Pot (9 cm)
Unique Plant Pot (9 cm)
Ceramic Plant Pot (9 cm)
Ceramic Plant Pot (9 cm)
Ceramic Plant Pot (9 cm)
Unique Plant Pot (9 cm)
Ceramic Plant Pot (9 cm)
Ceramic Plant Pot (9 cm)
Ceramic Plant Pot (9 cm)
Metal Plant Pot (9 cm)
Ceramic Plant Pot (9 cm)
Ceramic Plant Pot (9 cm)
Ceramic Plant Pot (9 cm)
Ceramic Plant Pot (9 cm)
Ceramic Plant Pot (9 cm)
Metal Plant Pot (8 cm)
RARE PLANT
You're lucky you found me!
Perfect for just about any cactus aficionado, these captivating Red Headed Irishman Cactis are part of the Mammillaria family and are best known for their distinct red spines and fleshy stems. They primarily originate from and are native to South America, where they grow in arid deserts and mountainous regions - giving them a versatile decorative edge in your spaces due to their natural low care needs. Great for gifting and sure to inspire whether you're new to houseplants or a seasoned grower, there's plenty to admire with this flowering, air-purifying and beginner-friendly variety!
Please note decorative pots are sold separately and your plant may vary naturally to that shown depending on size selected and growth variance. Each plant tends to be different, just like us!
Product Information
Product Information
For information about a different size plant, change your selection above.
| Average Plant Height | Below 10 cm |
| Internal Pot Diameter | 8 cm |
| Botanical Names | Mammillaria spinosissima |
| Other Names | Red Irish Cactus |
| Pet Friendly | Not pet friendly |
| Air Purifying | Air purifying plant |
| Water Requirements | Low water requirements |
| Light Requirements | Happiest in direct sunlight |
Reviews ★★★★★
Reviews ★★★★★
We have shipped over 250,000 houseplants & indoor plants to our happy customers.
We are rated "Excellent" 4.7 / 5 on TrustPilot and Google.
To see our latest reviews head to our reviews page.
Care Instructions
Care Instructions
Each houseplant requires different levels of care so every order is shipped with a handy care guide. For a few quick tips on how to care for Red Headed Irishman Cactus follow me!
Need further help? We have lots of handy guides dedicated to Indoor Plant Care
14 Day Freshness Guarantee
14 Day Freshness Guarantee
We only deliver the highest quality houseplants & indoor plants. We are so confident in our plants we give them a 14 day freshness guarantee.
Shipping & Returns
Shipping & Returns
Over 95% of our orders are delivered within 1-2 working day.
All of our products are shipped on an express delivery service which can be tracked as soon as it has been despatched. We use a number of different couriers to give you the best possible experience. Delivery Information
Delivery Charges
Delivery Charges
Our gift boxes and mystery boxes include free delivery.
For all other orders, our delivery charges are set out below.
Orders under £20 | £7.99
Orders £20 - £50 | £4.99
Orders over £50 | FREE DELIVERY
4.7/5
Based on 4700+
customer reviews.
250K+
Indoor Plants delivered
to our happy customers.
95%
Over 95% of orders are
delivered within 1-2 days.
100%
We check every plant to
ensure the best quality.
Other Names For Red Headed Irishman Cactus Houseplant
Mammillaria spinosissima, Red Irish Cactus.
Red Headed Irishman Cactus Care Guide
Red Headed Irishman Cactus Light & Water Requirements
I have Low water requirements and I am Happiest in direct sunlight.
Houseplant Freshness Guarantee
We only deliver the highest quality houseplants & indoor plants. We are so confident in our plants we give them a 14 day freshness guarantee.
Real Plants in Real Homes
See how our customers style their plants
I ordered a weeping fig and a spider plant. They arrived promptly and safely. I am delighted with my purchase. Highly recommend.
Truly amazing my plants arrived quickly and in perfect condition. The plants, four of them, had all been careful packed to protect their leaves and branches.
We are delighted with the ficus, delivered in good condition and it’s a nice shape.
All Good! Great little plants to add to a growing collection, look healthy, arrived as promised! What’s not to love ❤️
This is the 2nd time I have sent gifts using this service. Everyone was delighted with the quality of the plants and pot. The delivery was just as required with a time slot.
Pleasant surprise. It is a first company which has thought about everything. Even securing a compost in a pot, wrapping in paper. Absolutely first class service.
Professional and efficient service, plants arrive promptly, well packaged and in pristine order, very healthy. Excellent value for money. Houseplant UK is the best online company I have found in this category.
Fast delivery and plants were beautifully and carefully packed. Have bought plants from HousePlants multiple times with a consistent experience. Amazing quality.
Delivered in an excellent state, health and looking beautiful. I ADORE this site now I've discovered it.
I ordered a weeping fig and a spider plant. They arrived promptly and safely. I am delighted with my purchase. Highly recommend.
Truly amazing my plants arrived quickly and in perfect condition. The plants, four of them, had all been careful packed to protect their leaves and branches.
We are delighted with the ficus, delivered in good condition and it’s a nice shape.
All Good! Great little plants to add to a growing collection, look healthy, arrived as promised! What’s not to love ❤️
This is the 2nd time I have sent gifts using this service. Everyone was delighted with the quality of the plants and pot. The delivery was just as required with a time slot.
Pleasant surprise. It is a first company which has thought about everything. Even securing a compost in a pot, wrapping in paper. Absolutely first class service.
Professional and efficient service, plants arrive promptly, well packaged and in pristine order, very healthy. Excellent value for money. Houseplant UK is the best online company I have found in this category.
Fast delivery and plants were beautifully and carefully packed. Have bought plants from HousePlants multiple times with a consistent experience. Amazing quality.
Delivered in an excellent state, health and looking beautiful. I ADORE this site now I've discovered it.
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