Sempervivum Arachnoideum — Cobweb Houseleek Care Guide

Sempervivum Arachnoideum features rosettes covered in fine white webbing that looks like spider silk. Complete care guide for this hardy and unique succulent. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Fine white filaments stretch between leaf tips creating a cobweb effect. Tight rosettes that form dense mats of offsets over time. Extremely cold-hardy — survives well below 0°F outdoors. Pink to red star-shaped flowers on tall stalks in summer. Monocarpic — flowering rosettes die but are replaced by offsets. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: The cobweb effect is one of the most unique features in all succulents. Incredibly tough — one of the most cold-hardy succulents on earth. Native to European mountains — thrives in alpine rock garden conditions. Offsets prolifically — a single rosette becomes a mat within a few years. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Provide full sun — the cobweb effect is most prominent in bright light. Water sparingly — extremely drought tolerant once established. Use gritty, mineral-rich soil — thrives in rock crevices naturally. No winter protection needed — survives extreme cold. Remove spent flowering rosettes to keep the mat tidy. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Succulents & Cacti collection on Houseplants Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.