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Если вы хотите наиболее естественный, пусть только имитацию природного, рокарий, то не надо:

Не надо складывать камни таким образом, будто бы они случайно упали на ваш участок с неба, они должны быть "посажены".

Не стоит использовать разные виды камней – осадочные и вулканические породы вместе смотрятся не очень хорошо, а уж крашеные – вообще ужас ужасный.

Не стоит выкладывать из камней "булочки с изюмом" и "собачьи могилки". В природе не встречается концентрических нагромождений колотого гранита, а речь об имитации именно природы.

Яркие летники – не те растения, которые стоит использовать в рокариях. Ну, и прежде чем разбить рокарий на газоне, стоит много раз подумать, как за этим счастьем ухаживать-то?