  We discuss distinctive features of spiral states in bulk chiral magnets such
as MnSi and Cu$_2$OSeO$_3$ that stem from the effect of the cubic
magneto-crystalline anisotropy. First of all, at both the helical-to-conical
and the conical-to-ferromagnetic transitions, taking place at H$_{c1}$ and
H$_{c2}$, respectively, the cubic anisotropy leads to reversible or
irreversible jump-like reorientations of the spiral wavevectors. The subtle
interplay between the easy and hard anisotropy axes gives rise to a phase
transition between elliptically distorted conical states almost without any
detectable change in the period. We show that the competition between on-site
cubic and exchange anisotropy terms can also lead to oblique spiral states. Our
work gives clear directions for further experimental studies to reveal
theoretically predicted spiral states in cubic helimagnets beyond the
aforementioned well-established states thus, can help to understand the
magnetic phase diagram of these archetypal skyrmion hosts. In addition, we show
that properties of isolated skyrmions such as inter-skyrmion attraction,
orientation and/or nucleation are also rooted in the properties of host spirals
states, in which skyrmions are stabilized.
