Add some more default plant attributes

[danielbrendel]

The following attributes can be considered crucial and should be added as default attributes:

• Hardy: Boolean value that determines if a plant can come through the winter period
• Blooming time: DateTime(From - Till) to specify its blooming time period

[danielbrendel]

#383 Add sorting type phrase

[danielbrendel]

Advising users to create custom attribute for blooming time.