Learning about Past Mistakes?

I got this challenge from Kirsti and the theme is Learning about past mistakes.

The challenge was initiated by my namesake Riitta from the blog Garden Living.

Haaste kuuluu:

Kerro siis, mikä meni pieleen ja miksi? Esimerkkejä voi olla yksi tai useampia. Tärkeintä on kerätä huomioita, jotta tänä kesänä meillä menisi paremmin. Haasta kolme seuraajaa mukaan. Jätä vastauksestasi kommenttiin Puutarhaelon kadonneista oppia -haasteeseen, niin tiedän kerätä kaikki vinkit yhdeksi muistilistaksi.

My week point are Japanese maples. In the first photo you see the lime & gorgeous

Acer shirasawanum ’Aureum’. It lasted for two winters. When I dug it up the net surrounding 

the roots was still there - it had not rotten at all. Maybe it was one reason and the other winter frosts.

I have also lost 3-4 purple leaved Japanese maples. The first years I grew them in pot,

but the stairs of my cellar are too difficult. When planted into the ground, they froze the first winter.

Japaninvaahterat vaativat Suomessa ehdottomasti suojaisen mikroilmaston 

tai sitten talvetuksen kellarissa. Meillä tuulee liikaa, vähän päässä naapurissa punalehtinen japaninvaahtera viihtyy kadehdittavan hyvin!

In my post Ei mee ku Strömsössä  (Finnish text!) from 2015 I wrote about 

my disappeared clematis. Nothing like no-show phenomenon, they have really disappeared! 

Among them are Multi Blue, Ville de Lyon, Diana, General Sikorski & Etoile Violette 

- and there are probably more! I don’t dare to think about the money gone waste.

The main reason for poor success is that our soil is moraine / till and under it solid rock.

It is unsuitable for clematis. Even if it rains heavily the water disappears in an instant.

In addition I have not fertilized enough. Clematis need much water and fertilizers!

Sorry, I don’t have anybody to pass the challenge. Hope it is ok.