What soil mix is optimal for growing dahlia bulbs in urban settings?

Hey there! That sounds like such an awesome project! Dahlias are perfect for adding pops of color to your vertical garden. 🌼

Given your mix of clay and sandy soil, you're already on the right track with compost and perlite! Here’s a cozy soil mix I’d recommend for your dahlias that balances drainage and nutrients:

1. **Base Mix**: Start with 40% good quality potting soil. This will provide a solid nutrient base for your dahlias.

2. **Drainage**: Add in 30% perlite or coarse sand. This will help with drainage, which is super important for those bulbs since they don’t like to sit in water.

3. **Organic Matter**: Toss in about 20% compost. This will enrich the soil with nutrients and improve its overall structure.

4. **A Little Extra**: Finally, 10% peat moss can help retain moisture without making the mix too soggy.

So, to recap, the ratio would be roughly:
- 40% potting soil
- 30% perlite/coarse sand
- 20% compost
- 10% peat moss

Mix it all up and you should have a lovely blend that keeps your dahlias happy! Just make sure to keep an eye on the watering; dahlias like their soil to be moist but not waterlogged.

Also, don’t forget to give them some space to grow—these beauties can get quite tall and bushy. Good luck with your vertical garden, and I can't wait to hear about your vibrant dahlia display! 🥳🌼

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