I have to fill two rose borders (very few roses, actually) with some adequate herbaceous.
Conditions: Southern Japan, humid subtropical, acidic sandy soil.
I'm thinking to use Alchemilla mollis and Geranium 'Rozanne' : 50-50.
Now, the question is on the planting distance and therefore the total amount the plants I have to order.
The two borders have a total dimension of 65 m2
Depending what I will find at the Japanese nursery here, I'm thinking to do either:
1) 9cm pots : planting distance 15 cm : 49 plants x m2 : 1617 plants (for each type)
2) 2-3 litre pots : planting distance 20 cm : 36 plants x m2 : 1188 plants (for each type)
Do you think such a planting scheme can work? We aim for a good effect from the first year and... correct number of plants! In the attached picture, a sketch of my thoughts...
Any advice / opinion is more than welcome!
Thanks for reading.