If you want a stunning clematis vine, you need to feed it right. Knowing what is the best fertiliser for clematis is the key to those breathtaking blooms. This guide gives you simple, expert tips to get it perfect.
What Is The Best Fertiliser For Clematis
Clematis are hungry plants, but they don’t need anything too fancy. The best choice is a balanced, slow-release fertiliser. Look for a granular fertiliser with an equal NPK ratio, like 5-5-5 or 10-10-10.
NPK stands for Nitrogen (N), Phosphorus (P), and Potassium (K). Each part does a different job:
- Nitrogen (N): Fuels green, leafy growth and healthy vines.
- Phosphorus (P): Critical for strong root development and big, plentiful flowers.
- Potassium (K): Boosts overall plant health and disease resistance.
A balanced feed supports all parts of the plant equally. Organic options like well-rotted manure or compost are also excellent. They improve soil structure as they feed.
Understanding Clematis Feeding Needs
Clematis have two main growth phases. Your feeding should match these phases for the best results.
First is the spring growth phase. As new shoots emerge, the plant focuses on building its vine and leaves. A balanced fertiliser supports this vigorous growth.
Second is the budding and blooming phase. Just before and during flowering, the plant’s energy shifts to flower production. A fertiliser with a slightly higher phosphorus content can be beneficial here.
Overfeeding, especially with high nitrogen, is a common mistake. It leads to lots of leaves but very few flowers. It can also make the plant more susceptible to pests.
Step-by-Step: How and When to Fertilise
Getting the timing right is as important as choosing the right product. Follow this simple schedule for a happy, blooming clematis.
1. Early Spring Feeding
As soon as you see new buds swelling in early spring, give the first feed. Apply your balanced, slow-release granular fertiliser around the base of the plant.
- Follow the package directions for the amount.
- Gently scratch it into the top inch of soil.
- Water it in thoroughly.
This provides nutrients just as the plant wakes up. If you use manure or compost, spread a 2-3 inch layer as a mulch around the base, keeping it away from the stem.
2. Pre-Bloom Boost
About a month before your clematis is due to flower, usually in late spring, offer a second feed. You can use the same balanced fertiliser again.
Alternatively, you can switch to a liquid tomato fertiliser, which is higher in potassium. This supports good flower formation. Mix it with water and apply it to the soil according to the label.
3. Post-Bloom Care
After the first major flush of flowers fades, a light feed can help some varieties prepare for a second bloom. This is especially true for repeat-flowering types.
A liquid feed works well here. Avoid feeding too late in the summer, as this can encourage tender new growth that might be damaged by early frosts.
Special Tips for Potted Clematis
Clematis in containers need a slightly different approach. Nutrients in pots get used up or washed out much faster.
- Use a high-quality potting mix to start.
- Feed potted clematis more frequently with a liquid fertiliser, every 4-6 weeks during the growing season.
- Ensure pots have excellent drainage to prevent root rot, which fertiliser can’t fix.
A slow-release fertiliser mixed into the pot at planting time is a great idea. It provides a steady supply of food for several months.
Common Fertilising Mistakes to Avoid
Even with the right product, errors can hold your clematis back. Here’s what to watch out for.
- Fertilising at planting: Never add strong fertiliser to the planting hole. It can burn new, delicate roots. Just use good soil or compost.
- Over-fertilising: More is not better. Stick to the recommended schedule and amounts. Yellowing leaves can sometimes be a sign of overfeeding, not hunger.
- Neglecting soil pH: Clematis prefer neutral to slightly alkaline soil. If your soil is too acidic, nutrients get locked up. A yearly sprinkle of garden lime around the base in autumn can help maintain the right pH.
- Forgetting to water: Fertiliser needs moisture to dissolve and reach the roots. Always water well after applying dry fertiliser.
Complementary Practices for Healthier Vines
Feeding works best with good overall care. These habits make sure your clematis gets the full benefit of the nutrients.
Mulching: A layer of mulch over the roots is vital. Clematis like “cool feet.” Use bark chips, compost, or pebbles. Mulch keeps roots cool, retains moisture, and suppresses weeds that compete for food.
Watering: Consistent moisture is crucial, especially during dry spells. Deep watering once a week is better than light daily sprinkles. It encourages deep roots.
Pruning Correctly: Pruning groups matter. Feeding a clematis pruned at the wrong time can waste energy. Know your clematis group (1, 2, or 3) and prune accordingly to direct the plant’s energy.
By combining the right fertiliser with these practices, your clematis will have everything it needs to thrive. You’ll be rewarded with a spectacular display that gets better every year.
FAQ: Your Clematis Fertiliser Questions Answered
Q: Can I use rose fertiliser on my clematis?
A: Yes, rose fertiliser is often a good choice. It’s typically balanced or slightly high in phosphorus, which supports blooming. Just check the NPK ratio to ensure it’s not overly high in nitrogen.
Q: Is tomato feed good for clematis plants?
A: Tomato fertiliser is high in potassium, which is great for flowering and fruit development. It’s an excellent option for that pre-bloom boost or for feeding potted clematis during the summer.
Q: How often should you feed a clematis?
A: For in-ground plants, a main feed in early spring and a secondary feed before blooming is usually sufficient. Potted clematis need more frequent feeding, about every 4-6 weeks during active growth.
Q: Why is my clematis not flowering even with fertiliser?
A: Several reasons could be the cause. Too much nitrogen can promote leaves over flowers. Incorrect pruning can remove flower buds. Also, not enough sunlight (clematis need at least 6 hours) or a young plant simply settling in can delay blooms.
Q: What is a good homemade fertiliser for clematis?
A: Well-rotted compost or manure is the best homemade option. You can also use compost tea. Mix a handful of compost in a bucket of water, let it steep for a day or two, and use the strained liquid to water your plants.
Q: Should I fertilise clematis in the fall?
A: No, avoid fertilising in autumn. This can stimulate new growth that will be vulnerable to winter frost. The last feed should be done by mid-summer at the latest.